MB&F Legacy Machine Perpetual Now Comes in Steel

New Watch! • 21 Mar 2023

MB&F Legacy Machine Perpetual Now Comes in Steel

Launched in 2015, the MB&F Legacy Machine Perpetual has been crafted in numerous metals, from various alloys of gold, to platinum and titanium, and most recently, in palladium. Today, MB&F introduces the Legacy Machine Perpetual in a stainless steel edition that is sure to delight enthusiasts and collectors alike.

A New Colour Combination

The MB&F Legacy Machine Perpetual Steel features a rich salmon-coloured plate: the steel and salmon combination being a first for MB&F. The new edition also inherits the ergonomic corrector pushers first seen on the LM Perpetual EVO editions.


Wrist shot of the MB&F Legacy Machine Perpetual Steel


With its open dial revealing the full complication and suspended balance, it’s the harmonious mechanical beauty of LM Perpetual that really steals the show. And in an interesting technical twist, that eye-catching balance hovering on high is connected to the escapement on the back of the movement by what is likely to be the world’s longest balance staff.

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.

Taking a clockwise tour of the dial, at 12 o’clock the hours and minutes nestled between the elegant arches of the balance; 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.

While the view through the display back is animated by the escapement, the spectacular hand-finishing of the bridges and plates really captivates the eye.

Read more: Max Büsser on The LM Perpetual

A Fully-Integrated Purpose-Built Movement

LM Perpetual features a fully integrated 581-component calibre − no module, no base movement − with a revolutionary new system 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.


Front and back view of the MB&F Legacy Machine Perpetual in stainless steel
MB&F Legacy Machine Perpetual Steel with salmon dial


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, making this much more user-friendly and intuitive.

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 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.

LM Perpetual turns the traditional perpetual calendar system on its head by using a “mechanical processor” instead of the conventional space-consuming 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.

Discover the MB&F Legacy Machines at The Hour Glass


MB&F LM Perpetual Steel on the wrist

Tags: legacy machine legacy machine perpetual mb&f

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