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Technological developments don’t occur in a linear fashion. This watch is the perfect example. While the perpetual calendar was invented by Thomas Mudge in 1762, it took more than 250 years for Patek Philippe to invent the annual calendar complication used in this ref. 5146G.The first annual calendar, the ref. 5035, was introduced by Patek in 1996. Sporting a day, date, and month function, the watch can distinguish between months that are 30 and 31 days in length. As a result, you only have to manually adjust the watch once a year, at the end of February.The path breaking ref. 5035 was succeeded by the ref. 5146 Annual Calendar in 2005. The biggest differences between the two is the noticeable increase in size (going from 37 mm to 39 mm) as well as the introduction of a moonphase complication and power reserve indicator that add some visual depth to the dial.This 5146G from 2006 features an 18k white gold case with a mesmerizing concave polished bezel. The case sports a sapphire see-through case back giving full view to the expertly finished automatic movement with a 21k yellow gold rotorThe cream lacquered dial features 18k white gold applied baton markers, 18k white gold applied Arabic numerals at the quarters, together with elegant lume-filled leaf hands. The sub-dials at the 3 and 9 o’clock position display the month and, while the date can be read through a large aperture at the 6 o’clock position.This 5146G has just returned from a full service at Patek Philippe and includes the corresponding service papers as well as the original box and papers. The watch comes on a black alligator leather Patek strap with an 18k white gold Patek-signed deployant buckle.