After many current Panerai, I finally found "the keeper" PAM, a complete and very nice 2A which is everything I need and want: simplicity close to its roots, tritium patina and wearable size (for me).

Now the interesting thing is: I recently found a 2A offered at an US dealer that just made me wonder:


My 2A shows a "millesimation" of 1000 units in the A series, whereas the other 2A is limited to 1500 units.
Question to the experts: what is the logic behind that? Thanks for your help!