New Sub Date Running 4 Seconds Slow

[padi56]

Originally Posted by Erix

Hi all,
My sub date D series bougth NIB from AD started of with +2s/day.
After a few months I noticed it was going +3s/day.
Last year it was going +4s/day.

I check from time to time and last check gave +5sec/day
In two years it has increased 3s/day.

I wonder if this is normal...I mean that the watch is slowly increaseing speed?
I was kind of hoping it would settle after a while.

Any input is appeciated...

Erix please stop worrying about your watch just little daily deviations are quite normal for mechanical watches.Try a few different resting positions at night,but as watches bed in they do mostly speed up by just one or two seconds.Just think of how many seconds in a day,and if your watch is out by 5 sec its still quite remarkable for a mechanical watch.But when your watch needs a service re-oiled and re-regulated,it will could be better.Now if it speeds or slows down outside the COSC spec,then just a bit of regulation is needed.

Originally Posted by chris_nor_cal

Peter, thats interesting--i have some hope. Im on the second day now, -4 again.

Well you have a very accurate watch then,now generally as the parts bed and wear in. Most watches tend to speed up by one or two seconds,give it a month or two. If then not happy get it regulated,most people would rather a slight gain
than a minus.