My solar-powered watch from 1995. Made when I was in charge of microelectronics at ISA France.

This was a prototype fitted with a white dial that lets through enough light for the solar cell to power the watch. I applied a special paint I had prepared directly on the solar cell - later we would do that on PET film that we cut into dials that were pad printed and mounted as usual.

And the 31 year old Panasonic battery still stores enough energy to come through the night!

#solarpower