Hey all, I just received a watch in trade from a friend, it's a Hamilton 917 movement in a wristwatch case. I like it quite a bit, but it's running very fast, to the tune of +3 minutes an hour. The power indicator also never hits the full mark, it gets about 3/4 of the way there though. When winding it seems to be fairly sturdy, no grinding or anything to speak of, it just stops eventually as I believe it should when fully wound.
Before I got the watch it had been sitting unwound for some time, perhaps a few months. Prior to that it ran well and the owner was winding it up every morning.
I'm looking for some advice on how to get it running properly. Will it need a cleaning or a more thorough service?