Something I have been wondering is why my three cal 861 watches all have different reserves and very different no's of turns to full wind.

If I run them all down, then:

Watch 1 (1980's) takes 40 turns to full wind & will last 40 hours;
Watch 2 (early 70's) takes 26 turns & will last approx 52 hours;
Watch 3 (early 70's) takes 80 turns before I get nervous about winding it more (even though the others come to a hard stop) but lasts under 24 hours.

Watch 3 spent a long time run down & I have recently been winding it daily. The other two are usually given a 20 wind top up every morning and run all the time.

Does anyone know if there is a simple explanation for all this ? Or does it indicate that something might be wrong with Watch 3 in particular ?

Thanks

 

48 hours is the specified PR, but some make 48-52 hours, when were all of the three last serviced?

 

Bugger, I was afraid it was something like that

Is it expensive to repair ?

 

$28 for a new mainspring from Ofrei, they're a consumable part

 

Thanks Ash. I won't sweat too much over that then.

 

Wish the buggers were not on the bottom so to speak

 

True, the trick is getting it apart and putting it back together without having any bits leftover, then you can call yourself a watchmaker lol

 

Actually that would be OK and correctable. The real trick is getting it almost all back together and not be missing a part.

 

Don't worry.

Someone other than me will be doing it