The world's first automatic perpetual calendar wristwatch. Patek only made 586 examples of this rare grand complication, one of their most important and beautiful watches to ever leave the Geneva workshops, all the remaining examples have proved exceptional investments but very few retain their original certificate of origin like this one! In superb condition throughout, with its 'back-to-back' PP crown, this yellow gold 3448 is powered by Patek's 'Geneva Seal' 27-460 Q and comes fitted to a black alligator strap with vintage PP pin-buckle.