Hello! I was given this wristwatch recently as a gift from my grandfather who got it from his father in turn. I'm curious if anyone could share some details, words of wisdom or general knowledge about it just from the dials, face and backside. I believe it was repaired once and the backside has been switched from the original. We're Swedish but I don't know if it was purchased in Sweden. From my google searches it appears to be of a 1940s model but I could not find one looking exactly the same. Turning it around it has some tiny note scribbled on its back which I would guess is something left by the watchmaker who made repairs. According to my grandfather the dials used to be luminescent with radium paint. I haven't checked with a Geiger counter though if it's still radioactive haha The watch winder used to have resistance once it was wound up completely but that stopped working a while ago which makes it very hard to wind up well and I don't want to possibly break it by overwinding it, is it fine to overwind? So I'm considering bringing it in for repairs. I find it fascinating and amazing that it still works. I think it says HP 5H78W-52496- on the back but the beginning could also be initials or some other meaning which I do not understand. I have not dared opening the housing/backside. I appreciate any info if you know anything about it. Not interested in selling and please forgive me for probably using the wrong terminology on watch parts. Best Regards!