Oils go funny with age.
I recently rescued a 1974 gents Bulova from a drawer at my mums. fully wound but not working.
A few shakes nothing. Sat it on the radiator, 48 hrs later working nicely. Has since sat on the mantle place for two weeks and is still running fine. Just looked and it has gained 40 seconds in 3 days.
Take the above as a comment from one with little knowledge.