Backwinder Ref.3573 + extrait d'archive + service - White gold case on blue leather strap with white gold Patek pin buckle, blue sunray O Swiss O sigma dial, white gold indexes and hands, caliber 350 automatic movement, sapphire crystal, crown affixed to the back of the case to accentuate its incredible elegance. Comes with box, papers and Patek service. Immaculate condition, extremely rare model!!