First launched in 2015, the LM Perpetual has been crafted
since in red gold, platinum, white gold and titanium. A new
18k yellow gold case with striking blue face now joins the
series: a limited edition of 25 pieces.
Limited to 25 pieces
Fully integrated perpetual calendar developed for MB&F by Stephen McDonnell. Manual winding with double mainspring barrels. Power reserve : 72 hours. Balance frequency : 18,000bph / 2.5Hz
Hours, minutes, day, date, month, retrograde leap year and power reserve indicators
Black, grey, brown or blue hand-stitched alligator strap
Folding buckle matching case material.
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