Today I'm wearing a vintage Hamilton Thin-O-Matic on a Speidel expandable bracelet which seems to be about as old as the watch (1960s.) This one was purchased by my dad and I don't believe he had it serviced. It's similar to my other Thin-O-Matic that was my grandfather's, but this one doesn't have a solid gold case and some of the details are different. If you look at the position of the hands you can see they don't line up correctly. This is easily fixed by removing the hands and resetting them, but while considering that I realized the case has no removable back, everything goes in from the front. Then I found this link that shows the tool and procedure for removing a crystal like this. I suppose if I want to have it fixed I'll probably take it to my watchmaker since I don't have the right tool and have little use for it, so I probably won't buy one. This watch is good looking and seems to keep good time, but if I keep it in my collection I will probably have it serviced and cleaned as well as fit a leather strap. I'd also be curious what movement is inside (whether it's a micro-rotor or regular automatic) and what year this one is from; I'm sure my watchmaker could tell me.