Geophysic Tourbillon Universal Time

In Context

At 43.5 mm it is a large watch — well above this catalogue’s 40 mm median, and enough to dominate a narrow wrist. At 14.9 mm it is a tall case, and it will catch on a cuff. The case back is open, so the movement is visible without taking the watch apart, and the sapphire crystal will resist everything short of deliberate abuse. 50 m covers rain and hand-washing comfortably; it is not a watch to swim in.

The movement winds itself from the motion of your wrist. 48 hours of reserve is enough to set it down on Friday evening and find it still running on Monday. At 28,800 vph the seconds hand advances 8 times a second.

8126420 stands on its own in this catalogue — no other reference here shares its base number. It pairs a blue dial with a platinum case. Beyond the time it carries a tourbillon.

Caliber 948 is a automatic movement by Jaeger-LeCoultre. It contains 388 parts and has a power reserve of 48 hours.