The Ref. 5153 features a very rare and complex officer’s-style case crafted by Patek Philippe’s master craftsmen. This new Calatrava Officier features a rounded bezel, a sapphire-crystal back protected by a hinged dust cover, lugs with rounded ends, screwed strap bars, and a distinctive turban-style winding crown. * Mechanical self-winding movement with date * Caliber 324 S C * Center sweep second hand * Silvery opaline dial, hand-guilloched center, applied gold hour markers * Sapphire-crystal case back protected by a hinged dust cover * Water resistant to 30 m * Yellow Gold * Case diameter: 38 mm Caliber: * Date * Center sweep second hand * Overall diameter: 27 mm * Height: 3.3 mm * 29 jewels, 6 bridges * Balance: Gyromax * Vibrations per hour: 28'800 * Power reserve: 45h max. * Number of parts: 213