Caro Stefano,
mille gracie! At first sight a very impressive comparison, but unfortunately my italian is not good enough to fully understand your writing and I´m waiting eagerly for the english version.

Nevertheless I think, that only Rolex can give 100% security about the authenticity of the shown watch. We can discuss and research over many pages the printings, logos and all the other details, but we will never come to a final conclusion. Therefore, if I were you, I would make a trip to Geneva and would show the watch to the Rolex-Service-Department. If they say “yes”, than the shown white 6542 is authentic, if they say “no”, we only have another example of a non-authentic 6542-bianco.

Several years ago, we had a RLX-member from inside Rolex and sometimes he gave some “kryptic” information. During a discussion about the white 6542, a well known GMT-specialist wrote: “The white GMT does not exist!” and our friend answered: “What I can see in reality in a certain company and what can be read in the archive of a certain company is not congruent with your opinion”. Reading between the lines gives the impression, that Rolex really made a white GMT-Master. But how does it really looks like, were there only a very few examples, where are those white GMTs today?

May be you have really found one of those, but in my opinion security about the authenticity can only give Rolex in Geneva.

Best Regards to Italy
Matthias