MBF Legacy machineFirst launched in 2015, the LM Perpetual series is one of the company’s best sellers – awarded Best Calendar Watch at the 2016 Grand Prix (GPHG) – with previous limited editions in white gold, red gold, platinum and titanium

The vast majority of these variations are sold out; it was time to introduce a new 18k yellow gold case with a deep blue face, limited to just 25 pieces.

Developed in collaboration with independent Irish watchmaker Stephen McDonnell, the 581-component LM Perpetual movement completely reinvented the perpetual calendar complication, eliminating the usual drawbacks such as skipping dates or jamming gears.

The calibre was designed from scratch for trouble-free, user-friendly use. A default 28-day month that adds extra days is required. But putting aside the remarkable technical aspects of this Machine, it’s the open dial revealing the full complication and suspended balance wheel that really steals the show.

The fully integrated, purpose-built movement of Legacy Machine Perpetual has been designed from scratch for trouble-free use: no more skipping dates or jamming gears, and the adjuster pushers automatically deactivate when the calendar changes, so no problems there either.

Traditional perpetual calendar mechanisms use a 31-day month as the default and basically “delete” superfluous dates for the months with fewer days – by fast-forwarding through the redundant dates during the changeover. A traditional perpetual calendar changing from 28 February to 1 March scrolls quickly through the 29th, 30th and 31st to arrive at the first.

Using an innovative system developed especially for Legacy Machine Perpetual, the subdials appear to “float” above the movement with no visible attachments. The skeletonised subdials rest on hidden studs, which is technically impossible with traditional perpetual calendar mechanisms because they would block the movement of the grand levier.