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Information from the Date Your IWC app. Hope this is a starting point. I believe other PW collectors on the Forum will give you more input as well.
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Corrected Date Your IWC info.
Seems you got a different answer than I did from the search, as shown in the photos in my last reply. That’s odd.
Here's what I get. I input 797594 rather than 797894 for movement number after looking more closely at your photo. And it is a cal. 74;)
Thank you Ben and Bill for clearing up the confusion Any pointers to good resources to read up on the different movements and lig. 17 H4 and all that, and really if it is worth keeping? It does make me curious.