Perpetual Calendar. Of all the complications in a watch, the one I
value most is the perpetual calendar. This complication adjusts the
date displayed on the watch to automatically account for the numbers of
days in a month and leap years, unlike the typical watch movement which
has to be adjusted when the month ends with less than 31 days.
Patek Philippe was the first watchmaker to bring the perpetual calendar
complication to wristwatches in 1925. In that sense, if you were to own
only on Patek Philippe Complication watch, and given how much they cost,
one is more than enough, a perpetual calendar watch or annual calendar
watch seems most apt.
Patek Philippe Ref. 5940J. Patek Philippe announced at BaselWorld
2012 a new perpetual calendar watch, the Ref. 5940J. Essentially, this
watch is a cushion-cased version of the iconic Patek Phillipe Ref. 5140.
The cushion shaped case is a design used watches released from the
1920's and into the 1960's, to the best of my knowledge. Recently we saw
Patek Philippe revive the cushion case design in the Ref. 5950A splits-seconds chronograph.
The case dimensions are 37 mm by 44.6 millimeters and is made of yellow
gold. The case is a slim 8.6 mm. Three sub-dials adorned the face of the
watch at the 3, 6 and 9 o'clock positions. The first, going clockwise,
dislays the month and whether or not it is a leap year. The second
displays the date the the phases of the moon. The third indicates the
day and weather it is day time or night time with a 24 hour hand.
The movement inside the watch is the Calibre 240 Q, which is a self
winding movement that beats at 21,600 vibrations per hour. The movement
has a 48 hour power reserve. Another notable fact about this movement is
that it uses a mini-rotor to keep it and the case around it as slim as
possible.
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