Moritz Grossmann Caliber 101.13

Caliber 101.13 is a manual-winding movement manufactured by Moritz Grossmann. It contains 401 parts, 37 jewels (secured in 4 gold chatons), operates at 18,000 vph, provides a 42-hour power reserve, and measures 36.4mm in diameter by 8.3mm in thickness. The movement features a complete calendar with date, day, month, and moonphase, paired with Grossmann's manual winder mechanism. It is in production and serves as the basis for several of the brand's calendar watches.