Urwerk’s titanium UR-300 Time Quantum replaces conventional wandering-hour arms with two independent bars forming a T-frame and carrying four three-sided prisms. Each hour, the bars exchange positions, their supporting carousel advances 72 degrees, and the prisms rotate simultaneously. The active hour numeral tracks minutes along a 108-degree arc at six o’clock.
Why it matters: This represents a substantive reworking of the wandering-hours architecture that has defined Urwerk since 1997, rather than simply a new case or dial treatment.