Donor movement · ref 100040
Certina 25-661 movement
Certina · 5306-115 · Ca 1967
Movement in its case
What I know is wrong with it
Dial damaged at 10 and in poor condition overall, scratched crystal, gold plating lifting from the case, verdigris on the lugs and spring bars. The movement runs evenly in all positions but heavily slow, and needs cleaning and a service.
No watch here has been pressure-tested. A period WATERPROOF or WATER RESISTANT stamp says nothing about the seals today, so treat every watch on this site as not water resistant.