w220
447
I think both are correct, depending on the production year of the watch
Sep 04, 2019,05:53 AM
I believe the 330 and 315 movements were first introduced with 29 jewels. Then it was changed to 30, and then later back to 29 again. I guess they went back and forth what is the best material to use at the position where the 30th jewel may be.
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Number of jewels in 3710
By: time _ zone : September 4th, 2019-05:34
I spotted two certs belong to 3710, one indicate 29 jewels and the other is 30. Which is correct? ...