German made, manually wound, 30.6 mm/7.5 mm, 306 components (including 40 jewels and 4 gold chatons), 4Hz, lever escapement, precision adjusted in five positions, plate and bridges made of untreated German silver, balance cock engraved by hand, 60-hour power reserve, Lange in-house balance spring, free sprung glucydur balance. Column-wheel chronograph with vertical clutch. Flyback function with precisely jumping minute counter. Stop seconds.