Share your favorites on Show & Tell

Monroe #1 High Speed Adding Calculator

In Office > Calculators > Show & Tell.
Recent activity178495 of 181630Norman Rockwell Matchbooka Schwinn Speedester
Love it
Like it

Add to collection

Please create an account, or Log in here

If you don't have an account, create one here.

Create a Show & TellReport as inappropriate

Posted 7 years ago


(1 item)

I have an electric Monroe #1 High Speed Adding Calculator that still works when plugged in. The sticker on the bottom says Calculating Machine Company New York, USA, #1, 100-135 volts -0-60 cycle, 100-135 volts D. C.

Thank You For Your Help,


Unsolved Mystery

Help us close this case. Add your knowledge below.


  1. Sara, 7 years ago
    I have a similar Monroe calculator. Interestingly it is not exactly the same, but the label is identical. My dad used it for years following WWII. I put a photo here:
    I found some info on a website here:
    I would love to learn how to operate it!

Want to post a comment?

Create an account or login in order to post a comment.