How many seconds +/- should a just serviced 1675 GMT be keeping?

[squirrelman]

Hi all quick question before I take my 1970 1675 GMT back to get adjusted again. I took the watch to my local watch maker for a clean and adjustment, and I got it back and have been really unhappy with is work so far. He gave it back to me with a broken clasp spring bar and the bezel was not attached right (it was spinning freely no tension). So now those are finally fixed I am checking the timing on it, and it seems to be losing about 8-10 seconds a day on both my wrist and the winder. This seems unacceptable for me, but I just want to get some opinions before it take it back again.

[iclick]

That's outside COSC specs (-4+6) and it is capable of doing much better. If the variance is consistent every day it can be regulated to better accuracy. Mine is a ca. 1969 GMT back from service about six months ago and can maintain near perfect time with a bit of self-regulation (see below). That's the best it's done in the 43 years I've owned it.

The wearer and his/her environment has much to do with accuracy, so my watch might run a bit faster or slower on your wrist. I would keep a precise record of the watch's accuracy for at least 10 days and take it back to the watchmaker with that report for another regulation. You can check it at www.greenwichmeantime.com.

Self-regulation is possible, too, up to a point. It will likely run fastest with dial up, slower with crown down, and slowest with crown up. You can position it as above at night to compensate for small variances. IOW if it runs a couple of seconds per day slow on your wrist, try parking it dial up at night and it may regulate itself, but the basic regulation at the balance wheel needs to be close for this to work. You likely won't be able to self-regulate it if it's running 8 sec./day slow on your wrist, so it will need a surgical regulation first.

[Vincent65]

just take it back again and have him regulate it - then find another watchmaker!

[skprd13]

My 1968 keeps spot on plus 3.2 secs. Per day give or take.

[Tools]

Originally Posted by squirrelman

Hi all quick question before I take my 1970 1675 GMT back to get adjusted again. I took the watch to my local watch maker for a clean and adjustment, and I got it back and have been really unhappy with is work so far. He gave it back to me with a broken clasp spring bar and the bezel was not attached right (it was spinning freely no tension). So now those are finally fixed I am checking the timing on it, and it seems to be losing about 8-10 seconds a day on both my wrist and the winder. This seems unacceptable for me, but I just want to get some opinions before it take it back again.

If you are not happy with it, have it regulated. Early slow beat movements aren't as consistent as the newer fast beat movements, however, they are easily capable of keeping time within 5 seconds a day or better.

Your watch is several years before COSC came into being and so would have never been tested to that standard. Still, Rolex was building watches that would likely have been able to meet them.

Another thing, the slow beat movements are very good at positional adjustments and can pick-up/lose a second or two overnight depending on how it is stored..

[StanGMT]

The really important thing is the consistency of the watch. As long as it is losing or gaining by the same amount each day it can be regulated. If it is not consistent then the movement needs checking.

My 1966 vintage 1675 GMT had exactly the same problem following a recent service, but after a few weeks settling-in I had it regulated and now it only needs 'face up' or 'winder up' at night to keep it +/- 1sec/day.

Stan.

[bearone2]

you may not be active enough to keep it wound.

if my rootbeer starts losing time, i swing my arm in 30 figure "8's" a day.