16013 w/ Tiffany & Co stamp, sigma dial, and chapter ring?

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I am very familiar with that comparison, in fact there is a better /updated version of that - that you have not found in your research.

So now, let's see, Xeramic can not make a definite call on the Tiffany writing based on your picture but you are now asking on TRF to do so. So on post #11 of this post you took back your concern (discrepancies), which we are not discussing here, based on Xeramic's view.

You should do as Xeramic said and post a better picture (I also agree you should), there (and here if you like for discussion), and see which response you like best..

As mentioned by Offrdmania, with these dials - provinance / papers - trump everything. Or you can pay for the premium and just state that Xeramic said it was good at the end..

Good Luck