Introducing MB&F LM Perpetual EVO in Titanium

The Low-Down

MB&F’s landmark Legacy Machine Perpetual, the award-winning perpetual calendar created for MB&F by Stephen McDonnell, takes on an ebullient new lease of life forged from lightweight and industrially resilient titanium.

First introduced in 2015, the new watch remains housed in a 44mm case. But for 2021 it has been redesigned to emphasize lightness, strength, openness and extreme clarity even in the darkest of light settings with an abundance of Super-LumiNova on the time and calendar indications. There’s also the specially developed monobloc shock-absorbing ‘FlexRing’ system which makes this new Legacy Master the most robust Perpetual Calendar to date.

MB&F LM Perpetual EVO in Zirconium
MB&F LM Perpetual EVO in Zirconium

The LM Perpetual EVO was launched in zirconium with three options of PVD/CVD dial-plate colour, including atomic orange – a hard to achieve color and a first for a Swiss watch. It comes on an integrated rubber strap for a smooth and comfortable wearing experience.

MB&F LM Perpetual EVO in Zirconium

Emphasizing more space and clarity in design, the new LM Perpetual EVO is bezel-less with the domed sapphire crystal now fused directly to the case. The resulting increased openness has allowed for greater legibility of the LM’s Perpetual calendar indications, as well as the seemingly suspended balance wheel. The bezel has been replaced with a sophisticated thermal bonding system between the sapphire crystal and the case.

MB&F LM Perpetual EVO in Zirconium
MB&F LM Perpetual EVO in Zirconium

Also new are revised pushers for adjusting the perpetual calendar. They have been enlarged into what MB&F like to call double-sprung oblong actuators, which help to increase tactile comfort and ease of adjustment. Remarkably, without the seal of a bezel, water resistance has been increased to 80 meters, achieved with the help of a screw-down crown. And protection against overwinding the mainspring barrel is assured by disengaging the crown from the winding mechanism when it is pushed in and tightened.

As for the EVO FlexRing, it’s an annular dampener fitted between case and movement, providing shock protection along the vertical and lateral axes. What’s an annular dampener? In mathematical terms it’s the region between two concentric circles, shaped like a ring or a hardware washer, hence the FlexRing. Made from stainless steel, the dampener renders extreme robustness to the delicacy of the perpetual calendar, solving one of the key problems of enjoying such a sophisticated watch in all kinds of conditions.

MB&F LM Perpetual EVO in Zirconium


Stephen McDonnel’s solution for a perpetual calendar has truly broken the mold. It not only looks visually stunning with its sub dials appearing to float in suspension, it’s also more accurate and more logical. The LM Perpetual EVO features a fully integrated 581-component calibre with no module, and one that is not compromised by the workings of a base movement. McDonnel’s perpetual calendar introduced a revolutionary new system for calculating the number of days in each month. The LM Perpetual EVO movement employs a “mechanical processor”. It counts 28 days instead of 31, seamlessly covering all days in a month with extra days added as needed with no need to skip dates or fast forward. The new lightweight and supremely resilient EVO models with the FlexRing enables the wearer to take a Perpetual Calendar watch wherever the mood takes them.

MB&F LM Perpetual EVO in Zirconium

Tech Specs

Material: Titanium
Dimensions: 44 mm x 17.15 mm
Water resistance: 80m
Movement: Fully integrated perpetual calendar developed for MB&F by Stephen McDonnell, featuring dial-side complication and mechanical processor system architecture with inbuilt safety mechanism. 72 hours power reserve. 581 components / 41 jewels
Functions: Hours, Minutes, Day, Date, Month
Strap: Integrated rubber
Price: TBC

Back to Top