Watch Vintage Casio c80 Calculator, Chrono, dual time, year 1980 new battery | WatchCharts
So I have this C80… but on fresh batteries, I can't seem to get any button to work, except the light. All others are unresponsive. I tried poking directly at the module
Casio+C-80+Wrist+Watch+for+Men for sale online | eBay