This MB&F Legacy Machine 3 Perpetual Calendar Limited Edition is rated 9.9 out of 10. 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 14mm 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. 72 hours power reserve. It comes with box and paper dated in May 2016. Limited Edition of 25 pieces.