With proper servicing they will all last indefinitely. What will ultimately kill a movement is parts availability, so I recommend the most boring, ubiquitous "workhorse" you can find... most likely the 2824.What caliber that can last forever ?
Tend to be simple mechanism (not even shock protection) and parts tend to be quite large so even if parts need to be custom made, they can probably be made quite cheaply? (That would be my guess)what makes pocket watches easy to keep running? I've never owned one, is it easily fabricated replacement parts or are the original parts still available?
If you recall, because of the way leap years work, in the year 2100 many perpetual watches will need to go to a watchmaker for adjustment. Talk about inconvenience! Geez!Forever is a long time.
Maybe choose a perpetual calendar so you don't have to be constantly resetting the date... it could get tedious after a few hundred centuries
Just book it as part of the regular scheduled service... unless you're off planet... which would be a drag considering how bad even many current wait times are.If you recall, because of the way leap years work, in the year 2100 many perpetual watches will need to go to a watchmaker for adjustment. Talk about inconvenience! Geez!