Posted 2 years ago
Gotta think I found this pen sometime back in the 1970's (-ish) when I was a student myself...also would bet (without specific recollection) that my teachers (and/or Mom) probably wouldn't actually let me *use* it to do my math assignments...?? <lol>
It is 7" long, and the red 'outer sleeve' between the black ends rotates freely around its barrel. There are 21 little holes in a row on the sleeve, when it is turned it reveals the number 1-12 in its first (unnumbered) hole, then the corresponding 'times [1-20]' number in each successive hole down the row.
It is 7" long, on one end there is most of a remaining mark that seems to read "UNIVERSAL", something else now illegible beside that.