I've heard several different answers to this question. I recently purchased a watch from a 'watchmaker' that's currently running a minute behind everyday. I spoke to the person I bought the watch from and they said this is accurate for the specific watch. Being a higher end watch I would expect the variance to be much less. I have several other watches that gain/lose no more then 30 seconds per day. Being a relative newbie to vintage watches, I would assume that after a full servicing it's possible to have a vintage movement fall with the original specifications for that movement. Am I incorrect in my assumption. I've read several posts here and else where and I can't seem to get a clear answer.