It's too late, I saw it...
freddy, I agree with your assessments. What I've seen of all the pictures on line both 'models' of the 6542 have many variances. And a good many are from the Rolex factory themselves. The dials used on the black were both gilt and white lettering, some 'T <25', some not. From what I read the bakelite insert lasted only about a year from Rolex, and was not installed in the Pan Am 'Executive' white face. Any bakelite insert watches they got in for service were replaced with the stamped insert. Later, after the 1675 came out any 6542 that came in for service was subject to getting the stamped insert, new 'Superlative' dial, the larger 4th hand and all black numbered date wheel. There seems to be no rhyme or reason to the changes, so I don't know if the watch owner had a choice in the changes or not. As you've said before, the bakelite insert was fragile and it is likely that none that we've seen are original, all an aftermarket from one source or another. I had not seen any pics of the white dial without the Pan Am globe on the case-back, but that is further 'good news' to me! It says to me that there is quite a bit more 'flexibility' in building a 6542, and it has the benefit of being the correct hand stack and no crown guards to be judged by the replica experts.