I had fully serviced last year a 1960's gold watch with an eta 2452 21 jewell movement and have worn it almost every day since. Love it. It loses about 90secs a week which I reckon is good and has a reserve of app. 32 hrs.
The one concerning issue is that if I let the watch run down I sometimes find that if I set the time and endeavour to give it a few winds it is very stiff to impossible whereas if I set the time ,give it a few shakes,wear it for an hour then try to wind it is smooth and easy!
Is this something not to worry about or should I take it back .The 12 month warranty is almost up.