Hello. First of all, english isnt my first language so I want to apoligize for bad grammar. I have this watch in my family. It belongs to my grandfather who passed away 40 years ago. I lost inner lid with Grand Prix markings. I never seen it, but dad told me that he remebers he had that lid inside. I want to know a bit more about history and model of this watch and possible year when its made. I found few simmilar ones but not exact looking one with Roman numerials. My plan is to give it to someone to restore his old shine. Thanks in advance!