The Caliber 876SQ further contains a full perpetual calendar as well as moonphase indicator. It also contains a power reserve indicator and AM/PM (day/night) indicator. The perpetual calendar has some unique features. One of them is a “safety indicator” which is located in the AM/PM indicator. It is a small window that when red means it is not safe to adjust the calendar functions (else you will break the movement. The 876 is also designed to indicate the full year as part of the calendar system. In this watch the year has been shorted to just the last two digits of the year. Jaeger-LeCoultre further claims that all of the perpetual calendar functions can be adjusted via one pusher.

In this Master Grande Tradition a Quantieme Perpetuel 8 Jours SQ watch, the 876SQ has never looked better. It feels so well suited to the design that JLC came up with. The case is in 18k white gold and 42mm wide – which makes for a good size on the wrist. The hour part of the dial, as well as the periphery of the movement on the back of the watch, is an 18k white gold and blue enamel ring. The deep sky-blue enamel fills in an engraved section for a very handsome look that frames the beautifully engraved bridges nicely. Don’t you love the rear of the watch showing bridges flowing out from the balance wheel like the rings on a globe? In short the straight-forwardness of how the caliber 876SQ displays information mixed with the beautiful skeletonization and enameling work make for a very handsome watch with a lot of visual complexity yet also legibility. Jaeger-LeCoultre will produce 200 pieces of the limited edition Master Grande Tradition à Quantième Perpétuel 8 jours SQ timepiece and they aren’t giving out the price at this time. I am guessing in the $150,000 range. jaeger-lecoultre.com

Master Grande Tradition à Quantième Perpétuel 8 jours SQ Technical Details
Movement:
– Mechanical manually-wound movement, skeletonized and engraved,
Jaeger-LeCoultre Calibre 876SQ
– 8-day power-reserve
– 260 parts
– 37 jewels
– 28,800 vibrations per hour
– 6.60 mm in height
Dial:
– Grained and silvered dials on a skeletonized and engraved movement
– Guilloché flange with translucent blue enamel
Back of the watch:
– Skeletonized and engraved movement, guilloché flange with translucent blue enamel also visible on the back of the watch
Hands:
– Hour, Minute: Feuilles
Functions:
– Hour, Minute.
– Perpetual calendar: day, month, date, year and moon-phases
The perpetual calendar functions are adjusted with the help of a single corrector situated at 8 o’clock
– Security indicator
– Day/night indicator
– Power-reserve indicator
Case:
– 42 mm in diameter
– 11.55 mm in height
– Water resistance: 5 bar
– Sapphire case back
Strap:
– Alligator
– Pin buckle in 18-carat white gold
References:
– Q50635SQ – 200-piece limited series