I have a SEIKO self-winder/Automatic I bought at the PX in Germany in 1980.
I have worn it daily until just a few weeks ago.
It has started loosing time!
A bit more than 5 minutes a day.
I may still try your "tap" method and see if it can be put right.
Last place that replaced the crystal said they can't repair these, I would have to ship it off to a shop that works on such devices.
I would like to get it back into service, wearing it is just part of the daily routine!
Richard