Moritz Grossmann’s Benu Tourbillon Earns a Patent

Introduced in 2013, the Benu Tourbillon with a flying three-minute tourbillon incorporates several developments conceived by Moritz Grossmann’s watchmakers for which utility model or patent applications were filed: the V-shaped design of the balance bridge (utility model registered), the stop seconds mechanism with a hair brush (patent pending) and the double minute display (patent pending).

In January 2018, the double minute display was the first of the new developments to receive a European patent (No. 2874021). To accommodate a particularly large tourbillon and an appropriately large tourbillon aperture in the dial of the Benu, the center minute display relies on two scales. The outer scale is interrupted by the tourbillon aperture in the range from 25 to 35 minutes; the missing segment is replaced by the inner scale. When the minute hand reaches the tourbillon aperture, its extension sweeps across the inner scale, allowing precise readings during that ten-minute interval. The attractive and unusual solution lives up to Moritz Grossmann’s ambition of delivering uncompromising precision.