Hi, i recently was given this watch from my father in law who passed away, I know he told me he bought it new in the 70's. everything seems to work, but the top chronograph button tends to stick, and the crystal is scratched. I'd like to get this watch cleaned up and the crystal changed, but would like to know on average what would this cost me? Is it worth getting fixed or should i just leave it like this (would this impact the value in any way)? I don't know much about watches, although i was suprised to read up on the watch and how popular it still was.