The Manufacture Calibre MT5400, with which the Black Bay 54 is equipped, displays hour, minute and second functions. Its variable inertia balance wheel is maintained by a sturdy traversing bridge with a two-point anchoring. This system, together with its non-magnetic silicon hairspring, enables the Manufacture Calibre MT5400 to function within a tolerance range of 6 seconds (-2/+4) tested on a fully assembled watch. MT5400 Manufacture Calibre is “weekend-proof”, with a 70-hour power reserve.
The Manufacture Calibre MT5602-U, which powers the third evolution of the Black Bay, is designed to ensure robustness and precision. To do this, the variable inertia balance wheel is maintained by a sturdy traversing bridge with two-point anchoring. This system together with its non-magnetic silicon hairspring, means the Manufacture Calibre MT5602-U is able to function within a tolerance range of 5 seconds (0/+5) tested on a fully assembled watch. Another notable feature is that the power reserve of the Manufacture Calibre MT5602-U Calibre is “weekend-proof”; that is to say, it has been certified for 70 hours by METAS.