interesting digital watches

[Ren]

Around late 1979- early 1980, I walked by a jewelry store in (small town) Langdon, ND.
In the shop window there was an LED watch (a bit late for the era) with a round red crystal.
Around the crystal were quite a few tiny buttons (more than 0-9 and 4 function) I made one of the buttons out to be square root. The price of the watch was way over my budget (student loan, rent, utilities, et al) IIRC $200 USD.
Never saw it again. I just did a search on TAS and didn't see anything like it either.

[edit] A DDG turned up this watch, it sort of resembles the one I recall, but if my old grey matter hasn't failed, the one I saw had more and concave buttons (like for a stylus).
https://www.theledwatch.com/led_watch_ur...lculator_2