u/Due-Floor3273

Hello! Absolute beginner here: this watch stopped working suddenly so wanted to take a look inside to see if I can identify the issue myself but…

I cannot find a way to open this. It is 1973 Omega Genève (cal 625 I think) so should be snap on case but I have tried everything (different case knives etc) and I am stuck.

Any advice or video showing how it is done?

Many thanks!