I have the exact same watch as this gentleman (who posted here before deciding to sell it on ebay) , given to my family circa 1974 so I believe it is a 351.
The only trouble with my watch is the battery(Energizer 357/303) is slightly unstable with the clamp.My watchmakers previously have cleaned the contacts (including the clamp) to improve the electrical contact. After a cleaning 2 months ago, the watch worked till now and stopped after I wore it out on a cold day.
I opened the case and tried to replace the battery but the prodding of the few months old battery with a toothpick made the watch ticked again.So i just left it there. the problem has reoccured frequently over the last few years
so I suspect the clamp is a bit worn and not holding the battery down tightly or I need the correct single application 357( not 357/303 Energizer) renata battery.
Where can I obtain such a battery clamp? or do i have to fashion my own clamp like this watchguy?
cant post pictures : google girard perregeuax 351 images
Girard Perregeaux dinosaur of quartz watchguy by christian