New Perpetual Calender Ref. 5550P
Patek Philippe have just released this limited edition watch. From Patek's website:
"Oscillomax® in the real world: New Perpetual Calendar Ref. 5550P in a limited edition of 300 Patek Philippe Advanced Research timepieces
The last three development steps in Silinvar® technology based on silicon were translated into Patek Philippe Annual Calendar watches with the caliber 324 S IRM QA LU movement. These watches were presented in limited editions of 100 to 300 pieces as “Patek Philippe Advanced Research” models, and each edition sold out within months."