[Senior Patek Moderator]
Indeed, some remarkable differences are even noticeable in "regular-catalog," simpler enamel references such as the 5131/5231 line, that in this type of models they become totally amazing! ;-)
Even the three "A.P" signatures are so different....My girlfriend just pointed out to me that the "press fish" at 6 o'clock goes the other direction than the rest of the school, unlike Michael's and mine!! And on and on.... This is truly the marriage of horology and art that I LOVE from Patek -- and I feel so glad I can own a few of these watches to stare at for HOURS in a row!
It will be great if you can ask this AD! Of course, receiving the "press watch" implies nothing more than a statistical fact (Patek will obviously deliver a brand new watch to that owner as well, by replacing the case if necessary). But chances are really high (33 to....100%! ;-) this AD might have gotten it, given an estimated production of 3 to 5 pieces.
I'm not even sure the store manager will be aware of the answer to this question, but they can certainly refer the lucky owner to our thread...who will be able to contribute if they so wish!