To kick off a year of celebration to mark their 20-year anniversary, MB&F launch two Limited Editions of 20 pieces each – the LM Perpetual Longhorn and the LM Sequential Flyback Longhorn.
LM Perpetual Longhorn
The special features for these limited edition timepieces, include a combination of stainless steel cases, rhodium-plated base plates, glossy black lacquer dials, blued hands and longer lugs (horns) which give them their name.
The Longhorn concept was actually born in 2009 during the design phase of LM1, MB&F’s first Legacy Machine. The idea of playing with longer lugs – also called horns – was pleasing to the eye but problematic regarding the location of the spring bars: close to the case or at the tip of the lug. Depending on the wrist size, this could lead to a bad fit.
So the long horns were switched for short horns and that was that, or so everyone thought. Fast forward to 2021 and the 10th anniversary of the LM1: the series had been closed but one prototype remained to mark this important milestone. To make the piece more special, the question of the long horns was raised once more, but this time with the idea of drilling two holes in the lugs – one at the tip of the horn, the other closer to the case – so the customer could decide. This one-of-a-kind timepiece came in stainless steel – and instead of the Legacy Machines’ classic white sub dials, it featured glossy black dials against a rhodium-plated base plate.
The first limited edition is the LM Perpetual Longhorn, containing MB&F’s GPHG award-winning perpetual calendar first released in 2015. Created in collaboration with independent watchmaker Stephen McDonnell, the 581-component, fully integrated and purpose-built movement eliminates the drawbacks of conventional perpetual calendars, offering a significantly more user-friendly and trouble-free solution. McDonnell’s perpetual calendar relies on a ground-breaking “mechanical processor” which avoids skipping dates and jamming gears as the adjuster pushers automatically deactivate when the calendar changes (below).
The second limited edition, the LM Sequential Flyback Longhorn, is derived from the LM Sequential which won watchmaking’s ultimate prize, the coveted GPHG Aiguille d’Or award in 2022. Also conceived by Stephen McDonnell, it was first released as the LM Sequential EVO and was MB&F’s first-ever chronograph – and 20th calibre. It featured significant technical innovations and an unprecedented combination of timing modes thanks to its “Twinverter” binary switch, allowing independent timing, split-second, cumulative and lap-timer modes. The Flyback version goes even further than the EVO edition as, on top of the previous timing modes, it adds the flyback function (below).
Both of these stunning anniversary editions are limited to 20 pieces, and cost CHF 168,000 + VAT.
Technical Specifications:
LM PERPETUAL LONGHORN
20th Anniversary Limited Edition: 20 pieces in stainless steel with black sub dials
Engine
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 14 mm 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.
Black lacquered sub dials
Power reserve: 72 hours
Balance frequency: 2.5Hz (18,000vph)
Number of components: 581
Number of jewels: 41
Functions/indications
Hours, minutes, day, date, month, retrograde leap year and power reserve indicators
Case
Material: stainless steel
Dimensions: 44 mm x 17.5 mm
Number of components: 69 components
Water resistance: 30 m / 90′ / 3 ATM
Sapphire crystals
Sapphire crystals on top and display back treated with anti-reflective coating on both faces.
Strap & buckle
Calf leather strap with stainless steel folding buckle.
LM SEQUENTIAL FLYBACK LONGHORN
20th Anniversary Limited Edition: 20 pieces in stainless steel with black sub dials
Engine
Fully integrated dual chronograph flyback system developed for MB&F by Stephen McDonnell, featuring Twinverter switch allowing multiple timing modes.
Manual winding with double mainspring.
Flying balance wheel with regulating screws at 12 o’clock, Breguet overcoil.
Superlative hand finishing; internal bevel angles highlighting handcraft; polished bevels; Geneva waves; hand-made engravings.
Black lacquered inclined dial & black sub dials
Power reserve: 72 hours
Balance frequency: 3Hz (21,600 vph)
Number of components: 619
Number of jewels: 63
Functions
Time display (hours/minutes) at 6 o’clock.
Left chronograph : seconds displayed at 9 o’clock and minutes at 11 o’clock; start/stop pusher at 10 o’clock and reset/flyback at 8 o’clock.
Right chronograph : seconds displayed at 3 o’clock and minutes at 1 o’clock; start/stop pusher at 2 o’clock and reset/flyback at 4 o’clock.
Twinverter pusher at 9 o’clock: binary switch that inverts the current start/stop status of both chronographs.
Both chronographs are equipped with a flyback.
Power reserve indication at the back of the movement.
Case
Material: stainless steel
Dimensions : 44mm x 18.2mm.
Number of components : 88
Water resistance : 30m / 3ATM / 90 feet
Sapphire crystals
Sapphire crystals on top and display back treated with anti-reflective coating on both faces.
Strap & buckle
Calf leather strap with stainless steel folding buckle.
For more information please visit MB&F