I work at a watch repair shop and wish I could fund public service announcements that the eco drives will not last forever if kept in the dark, ie stored in a jewelry box or a drawer longer than a few months. They use capacitors that become ineffective if allowed to die all the way. You need to keep them exposed to light, and even then ~15 years is the optimistic end of the capacitor’s lifetime.

IMO you’re better off with a cheaper Casio that can last ten years on a 5 dollar battery. When the capacitor fails in a solar watch due to being kept in the dark we charge 85$ to replace it.

Also the older eco drives are unserviceable and you’ll have to buy a new watch if something goes wrong in the electronics or mechanics.