The result is Legacy Machine Perpetual, featuring a visually stunning in-house movement, developed from the ground up to eliminate the drawbacks of conventional perpetual calendars. The 581-component, fully integrated and purpose-built movement of Legacy Machine Perpetual has been designed for user-friendly and trouble-free use: thanks to an innovative “mechanical processor”, no more skipping dates or jamming gears, and the adjuster pushers automatically deactivate when the calendar changes, so no problems there either.

TECHNICAL SPECIFICATIONS

Engine:

Fully integrated perpetual calendar developed for MB&F by Stephen McDonnell, featuring dial-side complication and mechanical processor system architecture with inbuilt safety mechanism. Manual winding with double mainspring barrels. Bespoke 14 mm balance wheel with traditional regulating screws visible on top of the movement. Superlative hand finishing throughout respecting 19th century style; internal bevel angles highlighting hand craft; polished bevels; Geneva waves; hand-made engravings. 

Power reserve: 72 hours

Balance frequency: 18,000bph / 2.5Hz

Number of components: 581

Number of jewels: 41

Functions / Indications: Hours, minutes, day, date, month, retrograde leap year and power reserve indicators

Case Material: stainless steel.

Dimensions: 44 mm x 17.5 mm

Number of components: 69 components

Water resistance: 30 m / 90' / 3 ATM

Sapphire crystals: Sapphire crystals on top and display back treated with anti-reflective coating on both faces.

Strap & buckle: Brown hand-stitched alligator strap with stainless steel folding buckle.