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Hand Alignment on Date Subdial - 3940/3941

 

On my 3941, I noticed that the hand on the date subdial was well-centered on the dial marker at the end of the month, but that the alignment has gradually deviated over the past two weeks. I used the pusher to adjust the date to test the alignment throughout the month. The hand seems to be well-aligned from the 22nd-1st but out of alignment from the 2nd-21st. Has anyone else observed this on their 3940 or other PC? Is this an indication that service is needed?

Here are some images to demonstrate:


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