I can trace the origins of LM2 back to two key moments: the first one was a collectors’ dinner about 10 years ago,
before MB&F had even started. The gentleman sitting next to me had a very classic, unassuming watch on his wrist.
I asked to see it and realised it was a piece by renowned watchmaker Philippe Dufour… Turning it over, I discovered
a beautiful movement with not one, but two balance wheels, connected via a differential system: this was the very
rare “Duality”, of which Dufour has apparently crafted only 9 pieces. I was stunned by the beauty of the mechanism
but also thought to myself, one day it would be nice to revisit the dual balance wheel idea, showcasing it in a more
The second moment was early in the development process of Legacy Machine N°1. One of the key features of LM1
was its world-first “flying” balance wheel, suspended high above the dial. Putting that together with the memories of
Dufour’s Duality seemed like a winning combination: we held the concept of LM2!
As always, next to our own team a fantastic group of Friends brought the concept to life – including Kari Voutilainen
and Jean-François Mojon for the movement and our loyal designer Eric Giroud for the general design.
Traveling deep into watchmaking history, LM2 is really about paying tribute to our amazing Horological ancestors.
Starting about 250 years ago, famous watchmakers like Ferdinand Berthoud, Antide Janvier and Abraham-Louis Breguet
experimented with dual balance wheel systems, in their quest to create more reliable clocks and pocket watches. Much
later, the first traces of dual balances combined with differentials appear; but the complexity and difficulty of creating
such differentials explains their scarcity, still today.
How does the differential work? In a few words, the LM2 has one source of energy: a single spring and barrel. That
energy is distributed by the differential to the two independent balance wheels and escapements, which each beat at
their own natural rate. The same differential then averages out those two rates, using that average to drive the hours