Editorial
The Seconde Mystérieuse does exactly one thing to stop you in your tracks: the central seconds hand floats, disconnected from anything visible, tracing its path around the dial with no apparent anchor to the movement beneath. Maurice Lacroix built this around a traditional mystery clock principle scaled to wristwatch proportions, and the effect holds up even when you know the mechanics. It is the most genuinely interesting thing in the Masterpiece catalog.
Maurice Lacroix introduced the Seconde Mystérieuse in 2012 as the headline piece of the Masterpiece line, their dedicated high-complication family. The mystery seconds principle dates to the 19th century and was popularized by Cartier in their famous mystery clocks, where the hand is driven by a transparent disc rotating within the dial rather than by a direct arbor. Applying that to an automatic wristwatch required developing the ML187 in-house, which Maurice Lacroix accomplished without outside movement sourcing.
The 43mm case in steel is sizable but appropriate for a dial built around visual drama at this scale. Over a decade in production the reference has remained largely unchanged, which is a good sign for a complication watch: it means the movement settled.
The mystery disc mechanism is delicate by design. Any impact that disturbs the disc's seating can cause the seconds hand to skip or stop without any obvious external damage to the case. Inspect the seconds hand closely before buying: it should rotate continuously and smoothly with no wobble or hesitation, because erratic motion usually points to disc wear or a misaligned drive ring.
Service history matters here more than on a conventional automatic. The ML187 is not widely serviced outside authorized Maurice Lacroix centers, so factor that into your cost-of-ownership math before buying on the grey market. Finally, confirm the dial has no moisture intrusion around the disc aperture, which can fog the transparent element and ruin the floating illusion entirely.
