Case material: Yellow gold; Charge: Automatic; Conditions: Never worn Presentation condition : With boxes and all papers; Model: calendar perpetual Price on request Gmtbroker Reference: 5159j-001 Patek Philippe 5159j-001 Complete Details: KNOWN AS AN "OFFICER'S WATCH" WITH A HALF HUNTER/HINGED CASE BACK. Polished finished 18kt yellow gold case. polished 18kt yellow gold hinged case back. White opaline dial with sunray guilloche textured center. Fine black printed Roman Numeral hour markers. Fine black printed minute/seconds & fraction of a second track with blue printed Arabic Numeral 5 minute/second incremental markings Blackened white gold hour & minute hands. Polished yellow gold seconds hand. Perpetual Calendar: Retrograde date function at the dial center, indicated with a blackened red-tipped white gold hand. Day of the week window display at the 9 o'clock position. Month window displayed at the 3 o'clock position. Leap year indicator window located beneath the 12 o'clock position. Moonphase display above the 6 o'clock position. The moonphase is accurate to 122 years and 45 days, and then only requiring a 1 day correction. Patek Philippe Caliber 324 S QR, beats at 28,800 vph, composed out of 361 parts, contains 30 Jewels & has an approximate power reserve of 35-45 hours. Featured Complications: Perpetual Calendar | Moonphase | Retrograde This watch is also known as 5159j001