Cal. MT5621 is the first in-house movement from Tudor, introduced in 2015.

Cal. MT5621 was the first Manufacture Tudor movement and features a power reserve indicator at 9:00. Most other features are more common, including central seconds, and a conventional date wheel. This movement features modern technology, including bi-directional winding, hacking seconds, instantaneous date change with crown-based quickset, and a variable-inertia balance with micro-adjustment by screw and silicon balance spring.