Jaap's Mechanical Calculators Page


Victor 6 Adding Machine Victor 7 Adding Machine

Victor 6-8-0 adding machine
Victor 7-8-0 adding machine

Victor 6-8-0 adding machine

This adding listing machine by Victor is designated Champion, but the underlying model type is probably 6-8-0. The first digit means it is part of the 6-line of machines, the middle digit says it has an 8-digit input (9-digit register), and the final digit meand it is manual rather than electric.

This adding machine has a full keyboard. If you enter a number on the keyboard and pull the crank that is on the right hand side of the machine, then the number gets printed and is added to the running total that is stored internally. After adding several numbers you can print the total by flicking the button next to the crank using your thumb just as you begin to pull the crank. That button can be moved in two directions - away from you for a subtotal (the register remains unaffected), towards you for a total (the register is cleared). Note that moving this button without using the crank has the effect of clearing the input from the keyboard. There is also a button on the left of the machine which disables the automatic clearing of the input so that you can do repeated additions of the same number.

This model does not do subtraction, but there are other, more expensive models in the 6-line that do.

Victor 6 Adding Machine
Victor 6 Adding Machine
Victor 6 Adding Machine
Victor 6 Adding Machine
Victor 6 Adding Machine
Victor 6 Adding Machine
Victor 6 Adding Machine

The machine has serial number 770,461 which dates it to about 1950. The case can be very easily removed. Pull off the crank, and move the two catches on the underside of the machine, and then the case can be lifted off. This has been made so easy to allow access to the ink ribbon.

Victor 6 Adding Machine
Victor 6 Adding Machine
Victor 6 Adding Machine
Victor 6 Adding Machine
Victor 6 Adding Machine

Victor 7-8-0 adding machine

This is the Victor model 7-8-0. It is in many ways identical to the Victor 6 above, except that it has a 10-key keyboard. Above the keypad is a small window with a pointer that indicates how many digits you have entered so far. On the left is a slider that will clear the entered input.

Victor 7 Adding Machine
Victor 7 Adding Machine
Victor 7 Adding Machine
Victor 7 Adding Machine
Victor 7 Adding Machine
Victor 7 Adding Machine
Victor 7 Adding Machine
Victor 7 Adding Machine
Victor 7 Adding Machine
Victor 7 Adding Machine
Victor 7 Adding Machine
Victor 7 Adding Machine

It has serial number 622,080 which dates it to about 1948. It shares many parts with the 6-line above. There are subtle differences too, which are presumably due to continuous minor improvements. For example, the handle of the crank is made of wood but two years later they were made from plastic.

Victor 7 Adding Machine
Victor 7 Adding Machine
Victor 7 Adding Machine
Victor 7 Adding Machine
Victor 7 Adding Machine
Victor 7 Adding Machine
Victor 7 Adding Machine


Here is a video where I demonstrate the Victor series 6 and 7 adding machines.


The Victor Adding Machine Company was founded in Chicago on 8th March 1918 by Oliver D. Johantgen, George S. Eldred und O.E. Cheesman. Johantgen was the main engineer. They had little experience in running a business, and the company would have failed if it were not for the investment and knowledge of Carl Buehler, owner of a chain of meat markets and grocery stores. Buehler was voted president of the company a few months later.

The first Victor adding machine was non-printing, and was put on the market in 1919. Two years later the Victor series 2 was released which was an adding-listing machine. The machine was cheaper than most equivalent competitor machines, and hence became popular with smaller businesses. The biggest order for the adding machines was by the McCaskey Register Company who turned them into cash registers.

In 1928 the series 3 appeared, which was able to do subtraction directly. Victor also attracted Max Garbell to develop a typewriter, but this was not successful enough so was discontinued when the great depression hit. The series 5 adding machine from 1931 was electrically driven, but also was a tough sell because the depression caused many second-hand Victor machines to appear on the market. Johantgen unexpectedly died in 1932, so eventually Thomas O. Mehan who had worked for Remington Rand was hired to be the new chief engineer. For Victor he designed the series 6 and 7, which were put on the market in about 1939.

During the second world war Victor manufactured various machinery for the military, most notably the Norden bomb sight that was also used by the bombers that released the atom bombs on Hiroshima and Nagasaki.

In the 1950s Victor hired the retired Oscar Sundstrand to improve on Mehan's designs, and he turned them into full four-function calculators that could do automatic multiplication and division.

In 1961 the Victor Adding Machine Company and Comptometer Corporation (formerly Felt and Tarrant) merged to become the Victor Comptometer Corporation. It stopped producing comptometers, but did import the Bell Punch Sumlock 993 which were rebranded as Comptometers. It seems that Victor was especially interested in the Electrowriter that Comptometer Corp was developing, which was an early kind of fax machine. It is notable that Victor also made electric vehicles, for industry and for use as golf carts, and this very successful sideline probably grew out of their wartime manufacturing efforts.

Victor managed to transition to electronic calculators, data automation, and computers. During the 1980s the calculator division went through several changes of ownership, but today still exists as Victor Technology LLC.


The following table lists the first several series of Victor machines:

11919-1921No printing. 8-column keyboard and 8-digit register. Retrospectively given the model number 110.
21921-1928As series 1 but with printing in two colours. Retrospectively given the model number 210. From 1924 also available with typewriter carriage.
31928-193?Optional Direct subtraction. Models 300/310/320 had a 6/8/10 digit register and no subtraction, models 300S/310S/320S are the same but with direct subtraction.
51931-193?Optional electric drive. Subtraction, and non-add button. Models 511S/521S had an 8/10 digit register and were manual, models 511S-12/521S-12 are the same but electric. Most easily distinguished from series 3 by fact that it has most of its control buttons on the right.
61938-1960sCompletely new design, portable, Bakelite case. Full keyboard. The more expensive version with direct subtraction had a slightly differently styled case. The model numbers were of the form 6-x-y where x is the number of digits in the input (5, 6, 7, or 8; register has one more digit) and y indicates whether it is manual (0 or 4) or electric (54). As further variants became avaliable (e.g. ones that allow subtraction, and can handle negative totals), the middle number was given other values.
71938-1960sSame as 6, but with 10-key keyboard. Model numbers 7-x-y where x,y same as series 6.

The model numbering then started to get very confusing as many further variants and successors of the series 6 and 7 were developed. There were for example series 60, 61, 16, and 67, with the corresponding 10-key equivalent series 70, 71, 17, and 77. Eventually the full keyboard variants were no longer viable, so further series only appeared with a 10-key keyboard. Some were released with the label Diplomat, Champion, Custom or Premier. The later series with multiplication and division were called the Divi-matic or Multo-matic. However, by 1973 the mechanical machines were obsolete and production ceased as cheap electronic calculators became available.

The following table shows the serial numbers at the start of each year of production. The table was constructed by combining several tables found online elsewhere.

Year1, 2, 3 line
1920 2,000
1921 3,500
1922 8,000
1923 23,000
1924 47,000
1925 65,000
1926 90,000
Year1, 2, 3, 5 linePortables
1940286,000 400,000
1941294,000 411,000
1942311,000 444,601
1943319,000 467,501
1945335,000 474,000
1946349,000 478,007
1947370,000 505,035
1948395,000 553,637
19495-419,000 639,178
19505-434,000 699,647
19515-445,000 777,509
19525-459,000 876,576
19535-473,000 957,440
1963 1,900,000
1965 2,000,000


This is an ink ribbon in its original box. It dates from after 1961, since the company name on the box is the Victor Comptometer Corporation.

Victor Ink Ribbon
Victor Ink Ribbon
Victor Ink Ribbon
Victor Ink Ribbon
Victor Ink Ribbon
Victor Ink Ribbon
Victor Ink Ribbon


Here are some advertisements and articles that I found in online archives of newspapers and magazines.

1919-03-28 Chicago Tribune (Illinois)
1919-04-11 Chicago Tribune (Illinois)
1920-02 Business Educator
1920-09-30 The Topeka State Journal (Kansas)
1920-10-03 The Topeka Daily Capital (Kansas)
1921-01-22 Wisconsin State Journal (Madison Wisconsin)
1921-02-21 The Spokesman Review (Spokane Washington)
1921-09-19 Chicago Tribune (Illinois)
1922-03-23 The Tampa Times (Florida)
1922-04-23 Chicago Tribune (Illinois)
1922-05-19 The Courier Journal (Louisville Kentucky)
1922-07-09 The San Francisco Examiner (California)
1922-09-08 The Ocala Evening Star (Florida)
1922-09-26 The Courier Journal (Louisville Kentucky)
1922-11-23 The Evening Kansan Republican (Newton Kansas)
1922-12-12 The Daily Sentinel (Grand Junction Colorado)
1922-12-25 The Courier Journal (Louisville Kentucky)
1923-01-25 The Courier Journal (Louisville Kentucky)
1923-03-22 The News Leader (Staunton Virginia)
1923-07-09 Twentsch dagblad Tubantia en Enschedesche courant
1923-11-06 Chicago Tribune (Illinois)
1923-11-23 Chicago Tribune (Illinois)
1924-02-29 Fremont Herald (Nebraska)
1924-03-01 The Morning Call (Allentown Pennsylvania)
1924-03-02 The Selma Times Journal (Alabama)
1924-03-03 Mount Carmel Item (Pennsylvania)
1925-06-09 Algemeen handelsblad voor Nederlandsch-Indie
1925-06-15 Times Herald (Olean New York)
1925-09-27 The Tennessean (Nashville Tennessee)
1925-09-29 Chicago Tribune (Illinois)
1925-10-15 Chicago Tribune (Illinois)
1925-10-27 Chicago Tribune (Illinois)
1925-11-19 Medford Mail Tribune (Oregon)
1926 The Caxy
1926-01-07 Chicago Tribune (Illinois)
1926-01-19 Chicago Tribune (Illinois)
1926-02-04 Chicago Tribune (Illinois)
1926-02-16 Chicago Tribune (Illinois)
1926-03-04 Chicago Tribune (Illinois)
1926-03-16 Chicago Tribune (Illinois)
1926-04-01 Chicago Tribune (Illinois)
1926-05-06 Chicago Tribune (Illinois)
1926-06-10 Chicago Tribune (Illinois)
1926-10-19 The Morning Herald (Uniontown Pennnsylvania)
1928-01-12 Herald Recorder (Arroyo Grande California)
1928-04-19 Herald Recorder (Arroyo Grande California)
1928-07-25 News Democrat (Paducah Kentucky)
1928-09-27 The Morning Call (Allentown Pennsylvania)
1928-12-04 The Pittsburgh Press (Pennsylvania)
1928-12-26 Evening star (Washington DC)
1929-05-21 The San Francisco Examiner (California)
1929-06-04 The San Francisco Examiner (California)
1929-06-11 The San Francisco Examiner (California)
1929-10-09 Palladium Item (Richmond Indiana)
1929-11-06 Palladium Item (Richmond Indiana)
1930-03-16 Seminole Producer (Oklahoma)
1931-01-15 Arnhemsche courant
1932-04-17 Chicago Tribune (Illinois)
1934-05-14 The Arizona Republic (Phoenix Arizona)
1934-10-11 Hartford Courant (Connecticut)
1935-02-22 Arizona Daily Star (Tucson Arizona)
1936-04-14 The Morning Call (Allentown Pennsylvania)
1936-09-27 Pittsburgh Sun Telegraph (Pennsylvania)
1938-01-08 De Maasbode
1940-06 Nations Business
1940-07 Nations Business
1940-09 Nations Business
1940-10 Nations Business
1940-11 Nations Business
1940-12 Nations Business
1941-01 Nations Business
1941-03 Nations Business
1941-04 Nations Business
1941-05 Nations Business
1941-06 Nations Business
1941-07 Nations Business
1941-08 Nations Business
1941-09 Nations Business
1943-04-26 Newsweek
1943-10-10 Chicago Tribune (Illinois)
1943-11 Camp Lejeune vs. No. Carolina Pre-Flight
1944-03-16 Hartford Courant (Connecticut)
1944-03-16 The Meriden Daily Journal (Connecticut)
1946 The 1946 Lucky Bag - USNA yearbook
1948-05 Fortune
1948-06 Fortune
1948-09-13 The Times (Munster Indiana)
1948-49 Hill's Fayetteville City Directory (North Carolina)
1951-10 Banking
1952-03 Nations Business
1952-04 Nations Business
1952-05 Nations Business
1952-06 Nations Business
1952-09 Nations Business
1952-10 Nations Business
1955-10 Nations Business
1955-11-14 Newsweek
1956-02-13 Newsweek
1956-05-07 Newsweek
1956-07 Nations Business
1956-07-09 Newsweek
1956-09-17 Newsweek
1957-04 Nations-Business
1957-04-15 Newsweek
1957-07-22 Newsweek
1957-09 Nations Business
1958-06-20 Electronics
1958-09 Nations Business
1960-01 Nations Business
1960-03 Nations Business
1960-05 Nations Business
1960-06 Nations Business
1960-11 Nations Business
1961-04-13 The Iron Age
1961-11-26 The Miami Herald (Florida)
1962-07 Nations Business
1962-09 Nations Business
1962-11-28 Nieuwsblad van het Noorden
1962-12-13 Nieuwsblad van het Noorden
1962-12-18 Nieuwsblad van het Noorden
1963-04 Nations Business
1963-10 Nations Business
1964-03 Nations Business
1964-05 Nations Business
1965-04 Nations Business
1965-06 Nations Business
1965-08 Nations Business
1965-11 Nations Business
1966-01-15 Algemeen Dagblad
1966-06-27 Algemeen Dagblad
1967-02 Business Education World
1968-04 College Management
1969-06 Nations Business
1969-09 Nations Business
1969-10 College Management
1970-02-11 The Evening Sun (Hanover Pennsylvania)
1970-03-11 Computerworld
1970-04 Nations Business
1970-09 Nations Business
1971-06 Modern Data
1971-07-01 Datamation
1972-05 Fortune
1972-06-15 Iron Age
1973-06-24 The Orlando Sentinel (Florida)
1976-08 Computer Design
1977-06 Digital Design
1997 What a year it was - 1948


Here are some articles that I found in online archives of newspapers and magazines.

1922-06-06 The Houston Post (Texas)
1923-02-01 Lansing State Journal (Michigan)
1923-02-26 The Star Press (Muncie Indiana)
1924-03-09 The Atlanta Constitution (Georgia)
1924-06-30 Eindhovensch dagblad
1924-12-07 Chicago Tribune (Illinois)
1927-02-27 Brooklyn Times Union (New York)
1927-11-14 The Morning Call (Allentown Pennsylvania)
1928-03-31 Austin American Statesman (Texas)
1931 Moderne Buero-Maschinen
1936-09-27 Pittsburgh Sun Telegraph (Pennsylvania)
1943-10-14 Santa Rosa Republican (California)
1943-10-16 Hanford Morning Journal (California)
1944-12-13 The Sheboygan Press (Wisconsin)
1945-04-24 The Times (Shreveport Louisiana)
1946-05-15 Chicago Tribune (Illiinois)
1946-06-21 The Mobile Journal (Alabama)
1950-10-10 The Boston Globe (Massachusetts)
1953-03-01 The Montgomery Advertiser (Alabama)
1957-10 Computers and Automation
1961-07-26 Chicago Tribune (Illinois)
1961-08-25 Marshfield News Herald (Marshfield Wisconsin)
1961-12-27 Chicago Tribune (Illinois)
1963-10-28 Chicago Tribune (Illinois)

Here are descriptions of Victor calculators and other products.

1924 The American Digest Of Business Machines
1925 Ernst Martin
1949 Efficiency op kantoor
1950-12 Business Education World
1952-05 Credit and Financial Management
1954-12-13 The Canning Trade
1956-10 Credit and Financial Management
1957-08 Firemen
1958-11 Credit and Financial Management
1959-01 Firemen
1959-03 Business Education World
1959-08-26 Financial World
1960-04 Business Education World 3
1960-04 Business Education World 6
1960-07 Computers and Automation
1961-03 Business Education World 2
1961-03 Business Education World 4
1961-03 Business Education World 5
1962-03 Business Education World 4
1962-03 Business Education World 5a
1962-03 Business Education World 5b
1963-03 Business Education World 7
1964-03 Business Education World 2
1964-03 Business Education World 7
1965 The Carl P. Dietz Collection of Typewriters
1967-03 Business Education World 6b
1972 Plastics History USA - J Harry DuBois
1976-05 Case and Comment


PatentFiling datePublish dateNameDescription
US 1,301,94129-05-191629-04-1919Oliver D. Johantgen10-key adding listing machine
US 1,301,94229-05-191629-04-1919Oliver D. JohantgenCarry mechanism
US 1,301,94329-05-191629-04-1919Oliver D. JohantgenRegister
US 1,306,11216-05-191710-06-1919Oliver D. Johantgen; Victor Adding Machine CompanyAdding machine (Victor 1)
US 1,336,84004-01-191813-04-1920Oliver D. Johantgen; Victor Adding Machine CompanyListing machine (Victor 2)
US 1,378,11904-01-191817-05-1921Oliver D. Johantgen; Victor Adding Machine CompanyRack-bar and bearing
US 1,396,21504-01-191808-11-1921Oliver D. Johantgen; Victor Adding Machine CompanyClear-signal printing
US 1,569,18802-04-192512-01-1926Oliver D. Johantgen; Victor Adding Machine CompanyAdding machine
US 1,580,49225-09-192213-04-1926Oliver D. Johantgen; Victor Adding Machine CompanyNon-add and Total key mechanism
US 1,757,66925-09-192206-05-1930Oliver D. Johantgen; Victor Adding Machine CompanyFlexible handle connection
US 1,788,91625-09-192213-01-1931Oliver D. Johantgen; Victor Adding Machine CompanyNon-add printing mechanism
US 1,810,21305-07-192716-06-1931Oliver D. Johantgen; Victor Adding Machine CompanyImproved subtraction mechanism
US 1,816,01427-04-192528-07-1931Oliver D. Johantgen; Victor Adding Machine CompanyExtra register
US 1,876,05623-09-192906-09-1932Oliver D. Johantgen; Victor Adding Machine CompanyPaper feeding mechanism
US 1,876,05723-09-192906-09-1932Oliver D. Johantgen; Victor Adding Machine CompanyItem counting mechanism
US 2,091,72824-08-193631-08-1937Harold W. Clark; The McCaskey Register CompanyKey release
US 2,098,48602-03-193609-11-1937Harold W. Clark; The McCaskey Register CompanyCash register with two drawers
US 2,160,53913-07-193630-05-1939Harold W. Clark; The McCaskey Register CompanyPaper equipment for cash registers
US 2,264,94905-01-194002-12-1941Thomas O. Mehan; Victor Adding Machine CompanyMotor drive
US 2,270,46005-01-194020-01-1942Thomas O. Mehan; Victor Adding Machine CompanyGovernor mechanism
US 2,274,91922-09-193803-03-1942Harold W. Clark; The McCaskey Register CompanyCode printing on cash register
US 2,276,46403-08-193917-03-1942Harold W. Clark; The McCaskey Register CompanySplit keyboard. See also: CA 397,820
US 2,277,49817-06-193724-03-1942Thomas O. Mehan; Victor Adding Machine CompanyAdding machine
US 2,281,85101-02-193705-05-1942Thomas O. Mehan; Victor Adding Machine CompanyPrinting mechanism
US 2,318,00014-03-194104-05-1943Erhard M. Lippert; Victor Adding Machine CompanyPlaten mechanism
US 2,329,12925-05-193907-09-1943Thomas O. Mehan; Victor Adding Machine CompanyRibbon mechanism
US 2,346,26530-12-194011-04-1944Thomas O. Mehan; Victor Adding Machine CompanyZero printing and column split mechanism
US 2,352,27925-05-193927-06-1944Thomas O. Mehan; Victor Adding Machine CompanyDetachable paper spool mounting
US 2,360,00530-12-194010-10-1944Thomas O. Mehan; Victor Adding Machine CompanyKey set control mechanism
US 2,362,70921-11-194114-11-1944Thomas O. Mehan; Victor Adding Machine CompanyCalculating machine
US 2,377,70701-10-194005-06-1945Thomas O. Mehan; Victor Adding Machine CompanyControl switch
US 2,378,85811-06-194319-06-1945Thomas O. Mehan; Victor Adding Machine CompanyGyro-vertical
US 2,379,44931-07-194103-07-1945Thomas O. Mehan; Hunter E. Hooe; Victor Adding Machine CompanyMultiplying machine
US 2,384,76110-11-194311-09-1945Thomas O. Mehan; Victor Adding Machine CompanyGyro-vertical
US 2,396,18806-03-194205-03-1946Thomas O. Mehan; Hunter E. Hooe; Victor Adding Machine CompanyCalculating machine
US 2,411,05023-12-194012-11-1946Thomas O. Mehan; Victor Adding Machine CompanyCalculating machine
US 2,429,52206-03-194221-10-1947Thomas O. Mehan; Hunter E. Hooe; Victor Adding Machine CompanyTransfer mechanism
US 2,475,51004-07-193905-07-1949Thomas O. Mehan; Victor Adding Machine CompanyTotal-taking control
US 2,486,95915-01-194001-11-1949Thomas O. Mehan; Victor Adding Machine CompanyCalculating machine
US 2,497,78415-05-194414-02-1950Thomas O. Mehan; Hunter E. Hooe; Victor Adding Machine CompanyRemote control mechanism
US 2,550,58122-04-194824-04-1951Thomas O. Mehan; Victor Adding Machine CompanyCredit balance mechanism
US 2,568,35014-03-194618-09-1951Thomas O. Mehan; Victor Adding Machine CompanyControl means for differential actuators
US 2,635,81215-07-194621-04-1953Thomas O. Mehan; Victor Adding Machine CompanyTransfer mechanism
US 2,824,68817-08-195425-02-1958Thomas O. Mehan; Victor Adding Machine CompanyTen key actuator stop mechanism
US 2,834,54214-01-195413-05-1958Oscar J. Sundstrand; Victor Adding Machine CompanyTotalizer engaging mechanism
US 2,860,57528-03-195618-11-1958William E. Sievers; Victor Adding Machine CompanyTag and ticket printing machine
US 2,984,41203-02-195616-05-1961Oscar J. Sundstrand; Victor Adding Machine CompanyPrinting calculating machine
US 3,024,97514-01-195413-03-1962Oscar J. Sundstrand; Victor Adding Machine CompanyMultiplication and division control mechanism
US 3,030,01014-01-195417-04-1962Oscar J. Sundstrand; Victor Adding Machine CompanyPrinting calculating machine


Victor Technology's website has a page about the history of Victor.
Wikipedia has an entry for Victor Technology.
Rechnerlexikon has a page about Victor, as well as the model 7-8-0, 6-8-0, and many others.
Made in Chicago Museum has an excellent write-up of the history of Victor.
John Wolff's collection contains a large number of Victor calculators.
Theodore Munk has a list of Victor serial numbers.
Rechenmaschinen illustrated has a few Victor machines.
Chris Staecker's YouTube channel has nice videos of what are probably a model 310, a 6-6-0, and a 7-56-4.
Wim Hasselo has several Victor machines.

© Copyright 2021 Jaap Scherphuis, .