MB&F goes green for Basel this year with its latest unorthodox perpetual calendar system


MB&F continues to expand its small and exclusive LM Perpetual family with a titanium model with a green dial joining the collection.

First launched in 2015 in red gold and platinum editions, and then in two white gold editions, the LM Perpetual is now also available in a titanium case for a limited edition run of 50 pieces.

The LM Perpetual turns the traditional perpetual calendar system on its head by using a “mechanical processor” instead of the conventional and much larger grand levier system. The mechanical processor uses a default 28-day month and then 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. So, 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.

Using a system developed especially for the 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.

At the 12 o’clock is the hours and minutes nestled between the 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.

Retail price is CHF 148,000 + VAT (same amount in USD).


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