/fa/ - Fashion

So my grandfather used to own this watch. No clue how long he had it, only that he wore it everyday in eternally humid climate (70s - early 2000s Singapore) according to my mother. Family nearly threw it out when he died because they didn't know the value.
I know next to nothing about watches, but I do know how expensive seamasters are. I'm fairly certain it isn't a knockoff, but who the hell knows. Let's assume it's real, how much do you anons think it'll cost to repair?