In 2015, MB&F created the LM Perpetual watch in collaboration with Irish watchmaker Stephen McDonnell. This new reinvention of perpetual calendar has been developed to eliminate the drawbacks of conventional perpetual calendars. Equipped with a spectacular in-house movement, this Legacy Machine has been released in various editions in red gold, platinum, white gold, titanium, and yellow gold.
The Legacy Machine Perpetual was the winner of the Best Calendar Watch Prize at the GPHG (Grand Prix d’Horlogerie de Genève) in 2016.
In 2021, a new limited edition of 25 pieces joins the series. Crafted in palladium 950, this new variant features an aquamarine sunray dial varying between shades of pale blue, green and grey. This new Legacy Machine also features the ergonomic corrector pushers first seen on the LM Perpetual EVO editions.
Its fully integrated 581-component calibre boasts an innovative mechanism for calculating the number of days in each month. And it holistically reinterprets the aesthetics of the perpetual calendar by placing the full complication on dial-free display underneath a spectacular suspended balance.
Traditional perpetual calendars have a few drawbacks: dates can skip; they are relatively easy to damage if adjusted while the date is changing; and the complications are usually compromises of modules powered by base movements. The fully integrated movement of Legacy Machine Perpetual has been designed to solve these issues. No more skipping dates or jamming gears, and the adjuster pushers automatically deactivate when the calendar changes.
Traditional perpetual calendar mechanisms use a 31-day month as the default and basically “delete” surplus dates for the months with fewer days – by fast-forwarding through the redundant dates during changeover. A traditional perpetual calendar changing from February 28 to March 1 scrolls quickly through the 29th, 30th and 31st to arrive at the 1st.
The perpetual calendar system of LM Perpetual features a “mechanical processor” instead of the conventional grand levier (big lever) system architecture. The mechanical processor utilises a default 28-day month and adds extra days as required. This means that each month always has the exact number of days required; there is no fast-forwarding or skipping redundant days. And while the leap year can only be set on traditional perpetual calendars by scrolling through up to 47 months, LM Perpetual has a dedicated quickset pusher to adjust the year.
The open dial of LM Perpetual generously reveals the full complication and suspended balance. Using an innovative system developed especially for Legacy Machine Perpetual, the sub-dials appear to “float” above the movement with no visible attachments. The skeletonised sub-dials rest on hidden studs, which is technically impossible with traditional perpetual calendar mechanisms because they would block the movement of the grand levier.
At 12 o’clock and nestled between the elegant arches of the balance, is the off-set dial featuring hour and minute hands. The open-worked dial structure also features day of the week at 3 o’clock, power reserve indicator at 4 o’clock, month at 6 o’clock, retrograde leap year indicator at 7 o’clock, and date at 9 o’clock.
Model: Legacy Machine Perpetual in palladium 950 with aquamarine face
Limited to 25 pieces
Fully integrated perpetual calendar developed for MB&F by Stephen McDonnell, featuring dial-side complication and mechanical processor system architecture with inbuilt safety mechanism. Manual winding with double mainspring barrels. Bespoke 14mm balance wheel with traditional regulating screws visible on top of the movement. Superlative hand finishing throughout respecting 19th century style; internal bevel angles highlighting hand craft; polished bevels; Geneva waves; hand-made engravings.
Power reserve: 72 hours
Balance frequency: 18,000bph/ 2.5Hz
Number of components: 581
Number of jewels: 41
Hours, minutes, day, date, month, retrograde leap year and power reserve indicators
Material: Palladium 950
Dimensions: 44 mm x 17.5 mm
Number of components: 69 components
Sapphire crystals on top and display back treated with anti-reflective coating on both faces
Water resistance: 30 m / 90′ / 3 ATM
Black, grey, brown or blue hand-stitched alligator strap with gold / platinum / titanium folding buckle matching case material.
Platinum 950 version with blue face: limited to 25 pieces
18k red gold version with grey face: limited to 25 pieces
18k white gold version with purple face: limited to 25 pieces
18k white gold version with dark grey face
Grade 5 titanium version with green face: limited to 50 pieces
18k yellow gold version with blue face: limited to 25 pieces