1958 Seamaster accuracy question

Hi, I would like to ask what accuracy would be expected from the 1958 Seamaster I inherited. I also wanted to thank all the members who provided helpful information on my father in laws watch. It was so interesting and especially helpful when I had the springs replaced ( they loved that I had the part #!) and crystal polished.
I manually wound the watch and then wore it for 7 days. Using Timeis as a reference, it lost on average about 25 sec. per day. What should be expected for a cal 501? Also, when I wound it I did about 15 turns. Can it be over wound and cause damage?
Thanks Again!

Great caliber in a great watch. Hope you get it looked after by a watchmaker, and wear in good health.

Hard to overwind. Wind until you feel firm resistance. You will know.

Hello,

As davidt said it depends on the condition of the movement and the service history.

I’d also expect a caliber 501 to be +/-10 sec/day if properly maintained.


Here is an older post from an omega accredited watchmaker (archer) on this caliber :

“Omega specs for the cal. 501 - note that these are measured over only 3 positions, so not 5 as a chronometer would be:

Average daily rate should be between -1 and +21 seconds per day.

Delta over 3 positions at full wind = 40 seconds

Delta over 3 positions at 24 hours after full wind = 50 seconds”

Again, it could be exceeding (in a good way) those metrics but it depends on the condition of the pivots, the poising of the balance wheel, the state of the jewels, etc.

A good watchmaker could address all these.

On a last note, your watch is an automatic so there are no risks of overwinding.

Thanks so much to everyone for the detailed answers to my accuracy and winding questions. I plan on wearing it and would like to preserve it, so it's off to the watch maker!
Thanks Again