Harmony Split-Seconds Ultra Thin

In Context

At 42 mm it is sized to the current mainstream: 40 mm is the median across every watch measured in this catalogue. At 8.4 mm thick it is about average for a modern wristwatch. 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. Rated to 30 m, it is protected against rain and splashes and nothing beyond that.

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 21,600 vph the seconds hand advances 6 times a second, the slower and more audible rate of an older design.

5400S/000P-B057 stands on its own in this catalogue — no other reference here shares its base number. It pairs a silver matte dial with a platinum case. It was a limited edition. Introduced in 2015.

Self-winding -through a peripheral rotor- movement with split-seconds chronograph and power reserve indicator.