alex
7312
some (very) quick answers...
Hi Speedy,
From what I recall these 3 watches date from the 60s, the 2573 comes with cal 10-200 and the 3428 and 3444 are equipt with cal 27-460 which was patek's first automatic movement. The 3428 has an enamel dial making it particularly sought after by collectors which also explains the high price it reaches at auctions.
I'll try to come up with some history if I can...