I believe LouS: s answer is spot on and therefore I quote it. "The dial is a question mark as it does not have "Polerouter Sub" nor the characteristic lume plots on the edge of the hour markers - rather, the whole marker is lumed in, like the fakes. I think I recall a co-branded Tiffany Polerouter Sub at Antiquorum that was missing the model designation."
It is a "question mark". I would be very cautious of shouting fake over everything out of the norm or just because you have not seen it before. In this case it has to be an overall judgement (or... as always). As LouS writes - he recalls a watch missing the model designation. That watch might not have been OK either - but it might.
One off/limited run dials do exist. Have a look at the dial in my link in a previous post above. All my experience and all my gut feeling about it says it is a genuine UGP-Sub one off dial/prototype/limited production. The way it came to me, how it is manufactured, patina, etc. I might convince some other collectors about its provenance and get it recognized as genuine. But it will always, by some, be considered as a potential fake. Again it comes down to overall judgement. Would it be a good idea to fake a dial that no one recognize or would it be a better idea to fake a dial that everyone identifies as the norm? Is there money or fame to be gained? Etc.
My gut feeling/overall judgement about the dial in the auction is that it could be OK. But as I wrote in my earlier post - " I would have expected" another dial. I for one, would not overly confidently say it is fake or that it is correct. It might be either and it should show in the price. When you are not sure - pay less or if you sit on info of it being rare and genuine pay more.
regards
JE
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