I have my Grandads watch from the mid Ninetys, and the battery has stopped again, I am trying to Identify the movement to find the correct battrey. I can read Miyota 1 jewel unadjusted on the left and push 4u10 on the right.
I googled 4u10 and it suggested a sr916sw battery. But when I tried to fit on it was too big. I would like to wear the watch but need to replace the battery first. Any help is greatly appreciated.
I've also come across references saying it's interchangeable for movement 4U13 (which is apparently an older one, although both now obsolete).
The 4U13 uses a 321/SR616SW battery, same height but smaller diameter.