In modern watchmaking, a perpetual calendar indicates the date, and corrects automatically for months with less than 31 days, as well as leap years. Unless the movement takes into account century years that are not leap years, a watch with a perpetual calendar will need manual adjusting in 2100, 2200 and 2300 but not in 2400. Usually, a perpetual calendar combines additional complications (a moon-phase, for example). From the WatchTime archives, here are six watches that are (almost) ready for eternity.
PATEK PHILIPPE PERPETUAL CALENDAR REF. 5940
Patek Philippe’s cushion-shaped Perpetual Calendar Ref. 5940 is now also available with a rose-gold case. It is powered by Patek’s ultra-thin Caliber 240 Q with micro-rotor. The case measures 37 mm by 44.6 mm. The Ref. 5940R-001 is available for $87,320.
HERMÈS SLIM D’HERMÈS QUANTIÈME PERPÉTUEL
In January 2017, Hermès unveiled a new version of the Slim d’Hermès Quantième Perpétuel with platinum case and blue dial. The watch is powered by in-house Caliber H1950, an ultra-thin mechanical movement with micro-rotor. The Slim d’Hermès Quantième Perpétuel in platinum is available for $39,900.
AUDEMARS PIGUET ROYAL OAK PERPETUAL CALENDAR
During SIHH 2017, Audemars Piguet unveiled the Royal Oak Perpetual Calendar with black ceramic case and bracelet. The 41-mm-large case houses the self-winding Caliber 5134. The price for the Audemars Piguet Royal Oak Perpetual Calendar in full ceramic is $93,900. For more on the watch and its movement, click here.
FREDERIQUE CONSTANT MANUFACTURE PERPETUAL CALENDAR
in 2016, Frederique Constant unveiled to the world the Manufacture Perpetual Calendar with a full, in-house-developed perpetual calendar, priced under $10,000. it is available in either a stainless-steel or rose-gold-plated case, priced at $8,795 and $8,995. We cover the Frederique Constant Manufacture Perpetual Calendar in detail here.
A. LANGE & SÖHNE POUR LE MÉRITE
The hand-wound Tourbograph Perpetual “Pour le Mérite” in platinum is A. Lange & Söhne’s most complex watch with the attribute “Pour le Mérite.” The in-house movement combines five grand complications: perpetual calendar, chronograph, rattrapante function, fusée-and-chain transmission and tourbillon. The 43-mm-large Tourbograph Perpetual (we cover it in depth here) comes in a limited edition of 50 pieces, priced at 480,000 euros.
GLASHÜTTE ORIGINAL SENATOR EXCELLENCE PERPETUAL CALENDAR
The Glashütte Original Senator Excellence Perpetual Calendar is based on the brand’s in-house automatic base movement, Caliber 36, and offers a 100-hour power reserve. The 42-mm watch sells for $22,000 in steel and $35,100 in rose gold. Click here for our full report on the watch from Baselworld 2017.