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Well, that is fast for a COSC chronometre. I think the specs for COSC are -2/+4. I have a watch timer and sat down and timed all my watches for accuracy. My most accurate one is a Daniel Jean Richard at +5.6s/week. The rest are around 2-6secs a day and the vintage ones are around 30-40seconds a day. If the beat is consistant and it stays within 5-10 beats variation a hour (speeds up and slows down) over the course of 30 minutes, you just need to adjust the speed. If the vibrograph looks like a sine wave (speeding up and slowing down), then the watch needs repair.
Also, watches tend to be more accurate when you're wearing them than if sitting on a dresser or in a common winder. This is due to the gravitational forces on the movement.
-David
: and about 1.5 minutes fast per week. Does it
: need to be serviced? Or is it normal??? How
: much should I expect the service cost be?
: Thanks!
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