Breathtaking from every angle, the Armin Strom Dual Time Zone Resonance Sapphire watch is an architectural and technical beauty. The horizontal, oval-shaped sapphire case is futuristic looking, and the symmetry of the two dials and the movement are harmonious. The watch combines two independent movements that display two different time zones, allowing you to set it to time zones that vary by 15 or 30 minutes. The two movements are synchronized in order to perfect the resonance (the natural frequency of the calibers) so that the force is constant throughout the 110-hour power reserve, which is powered by two barrels for each movement. To achieve the high-precision resonance, the independent Swiss brand spent three years developing its patented Resonance Clutch Spring, which resides in the ARF 17 manual-wind movement. That clutch spring keeps both balances (opposite one another at 12 o'clock) continually moving in opposite directions, yielding precision and a dramatic dance on the dial.