Borne from the historically-inspired Officer watch design, the Patek Philippe Perpetual Calendar Moonphase Grand Complications ref. 5159R features the classic officer watch case with a hinged caseback to protect its movement while simultaneously providing the wearer with an opportunity to view the incredible cal. 315 S QR movement found within its 38mm 18ct pink gold case. Playing further into the historical officer watch aesthetic, the ref. 5159R also features soldered lugs with screw-in bars spanning the gap and providing attachment for the matte-finish alligator leather strap. Perhaps its most stunning visual element, however, is the ref. 5159R's beautiful opaline-white hand-guilloched dial with a retrograde date hand, day, month and leap year indicators and a moon phase indicator sitting proudly at 6 o'clock. An interesting watch from a design perspective that is simultaneously filled with incredible watchmaking prowess and heritage, the ref. 5159R would make an excellent addition to any collection.