Patek Philippe Annual Calendar Moonphase

In 1991, the soon-to-be graduates at the Geneva School of Engineering were presented with their final project prior to receiving their diploma — simplify the perpetual calendar. Although the task was easier said than done, their work led to the inception of the annual calendar complication, patented by Patek Philippe in collaboration with the bright engineering minds at the GSE. Five years later, Patek debuted the Reference 5035 which marked the world’s first-ever annual calendar movement and finally bridged the gap between a triple date function and the formidable quantième perpétuel. This piece, a Reference 5146J, is housed in a beautifully proportioned 39mm 18k yellow gold case with a sapphire crystal, signed crown, and a smooth polished bezel. It features a luminous sunburst anthracite toned dial with applied indices, recessed subsidiary registers indicating day and month, a moonphase aperture and date window at 6 o'clock, and a matching luminous 'feuille' handset. Powered by Patek Philippe's Calibre 315 S IRM QA LU self-winding movement, it comes complete with a signed black alligator leather strap, signed 18k yellow gold deployant buckle and Certificate of Origin confirming serial and movement numbers and original sale in Vienna. This piece packs pedigree, elegance, function and outstanding craftsmanship - exactly what you'd expect from a Patek Philippe!