"Computer" Pen with Multiplication Tables

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This 6" gray plastic ballpoint click pen has eleven round holes on the side that reveal a rotating multiplication table. The first hole shows a number between 1 and 10. The other holes show multiples of that number from 1 to 10. Clicking the pen rotates the table. The pen's metal pocket clip is marked: MOD (/) DEP (/) COMPUTER. This pen was found in the Museum collections in the 1980s.
Currently not on view
date made
late 20th century
place made
United States
Physical Description
plastic (overall material)
metal (overall material)
overall: 15.1 cm x 1.5 cm x 1.2 cm; 5 15/16 in x 19/32 in x 15/32 in
ID Number
catalog number
nonaccession number
writing implements
Table, Mathematical
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Pens and Pencils
Data Source
National Museum of American History


I had one of these ( although it was red) when I had to get to grips with those times tables I was a bit vague on. The year was probably 1980, in the U.K. I chose just one to learn and I found the pen really useful ; I can still reel off my 9 x tables super-fast. My oldest boy is learning his times tables and has heard about my pen and wants one, however although I’ve looked I’ve not been able to find one and now I know why- it’s a museum piece!

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