Hamilton Masterpiece awarded to my granddad-in-law upon his retirement in 1966 and worn continuously until the crown came off. Here are the "before" and "after" picture:
The crown is temporary. I'd say the watch looks quite a bit nicer after cleaning the case and buffing the crystal.
Thankfully, it runs eagerly (although I have now jinxed it, no doubt...)
Anyway the 25 Jewel grade 620 has the microrotor -- so thin! I will have it professionally serviced sometime soon.