Patek Philippe Annual Calendar Moonphase

Overall Condition: Great condition overall. Case and bracelet show light signs of wear consistent with age and use. Dial and handset are in great condition with no visible blemishes noted.

In 1991, the soon-to-be graduates at the Geneva School of Engineering were presented with their final project prior to receiving their diploma — to 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, a watch powered by the world’s first-ever annual calendar movement and one that finally bridged the gap between a triple-date function and the formidable quantième perpétuel.

This slightly later annual calendar, a Reference 5146/1J-001, 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, white 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 324 self-winding movement, it comes complete with an incredible 18K yellow gold bracelet that adds a reassuring heft to the beautiful piece.

This piece packs pedigree, elegance, function and outstanding craftsmanship — exactly what you'd expect from a Patek Philippe!