FabR[Senior Patek Moderator]
26166
A 30-year window is very unlikely but in principle possible, though it seems even more unlikely to me for this specific reference.
Aug 24, 2020,22:01 PM
Reference 2526 was produced through the 1950's in very few pieces (of which less than 500 in yellow gold, the most common metal). The 12-600 movement, historically the first automatic movement made by Patek, as far as I know was also discontinued around the same time.
Is this an Extract that you received for your watch? A typo is of course always possible, but the odds would seem minimal (and for this certificate, a typo would have occurred twice! ;-) Not being familiar with this specific watch it's hard for me to give you more information, but let me say that in the event it was really encased and sold in 1985 with this old (and iconic!) movement, that would definitely add some extra interest to an already significant vintage Calatrava! ;-)
Thanks for sharing, and I hope you will be able to get a definitive answer