it's that itsy, bitsy, teeny, tiny, ever so light scratch on the bezel, on the "12" side of the "11", that helps trace it's lineage / pedigree.

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David & Jeff,

Boy, you guys are better than dna typing for recognizing a great watch. Here are a bunch of crops from my photos showing many angled views of the tell tale scratch. No doubt about it and what better authentication than from OTD contributors. I had been waiting a long time till a really good example ot this watch came along. I shall protect and preserve it for the next custodian ( we never own anything, we only have temporary custody ). Thanks for the earlier pictures, I shall combine them with the current batch. BTW that is a very dark blue band not black as it first appears.