Glashütte Original 51-01

Caliber 51-01 is a manual-winding movement manufactured by Glashütte Original in Germany. It measures 26.2 mm in diameter and 6.1 mm thick, operates at 21,600 A/h, provides 40 hours of power reserve, and contains 21 jewels plus two diamond bearings. The movement features a cantilevered minute tourbillon and a perpetual calendar complication. It remains in production.