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PANERAI OPIII DATE ADVANCES ONLY HALF DAY

Sassman
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Sassman New Member

Sassman

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I was able to diagnose an odd issue with my Panerai and thought I would share in case anyone ever experiences it also. 

After I performed a full service on my pam00091, which uses the OPIII movement. The OPIII is a modified Valjoux 7750/7765. After reassembly I noticed the date wheel would only advance half a day. Showing half of the previous day and next day. After verifying everything was properly lubricated I studied in more depth the way the date advance operated. Noticing something a bit strange I put it under the microscope. Low and behold there was a tiny microscopic crack in the date jumper.  It appears as if it was in the original part as the chrome plating follows the crack and may have been just enough to hold it together. Cleaning or bending it to reinstall looks to have been more than it could take. I have to imagine a fault in a part of this type is rare, but maybe not. 

Hope this helps someone in their search for a similar fault.

Screenshot 2025-04-15 113234.jpg

Screenshot 2025-04-15 113234.jpg

Edited by Sassman
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