D. Dornblüth & Sohn 99.1

Caliber 99.1 is a manual-winding movement manufactured by D. Dornblüth & Sohn, based on the ETA 6498-1 architecture. The movement features small seconds at 6 o'clock and operates at a frequency of 2.5 Hz with a power reserve of approximately 46 hours. Dornblüth modifies the Unitas base substantially, claiming 60-75% in-house content with traditional German finishing: a 3/4 plate, swan-neck regulator, and flame-blued screws. The 99.1 is hand-finished with beveled edges and screwed gold chatons, distinguishing it from the base movement. It remains in production and serves as the core caliber within the manufacturer's 99 Series family.