Hello all, I have recently received a Longines watch that was owned by my late grandfather, the only details I have of the watch are he purchased it in the 50’s, maybe earlier. My Nan says it's 18kt Gold, there's nothing on the back of the watch, just plain Gold, the strap is gold and doesn't seem like it can come off, It's manual winding and that's about it. I'm trying to find what model it is as I would like to find out the history on the watch and how many units were made etc. It also has a broken clasp so trying to figure out where in London I can take it to be fixed. This watch will be going nowhere and it will be passed down through the generations to come. Thanks for any help and information. Christian.