Calibre 9001, Manufacture Rolex. Mechanical movement with bidirectional self-winding via Perpetual rotor ball bearing. Officially certificed Swiss chronometer (COSC). Oscillator fraquency 28,800 beats/hour (4Hz). Paramagnetic blue Parachrom hairspring. Travering balance bridge. High performance Paraflex shock absorbers. Jeweling 40 Rubies, Power Reserve 72 hours.
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