Recommended Vintage OMEGA WATCHES (only) On EBAY (NOT for Inquiries)

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I see the "105.012 66" and "HF" stamped on the caseback and the -66s have single bevel casebacks.. what would make it a service caseback? I'm always learning..
 
Posts
273
Likes
610
I see the "105.012 66" and "HF" stamped on the caseback and the -66s have single bevel casebacks.. what would make it a service caseback? I'm always learning..
I thought the square indentations that are used to unscrew the case back are too big and almost touch the edge. I was under the impression that this is indicative of a service replacement but I too am learning. Happy to be corrected. 😎