Zenith Defy Double Tourbillon 46mm | 10.9000.9020/79.R918Black carbon case. Case size : 46 mm. Case thickness : 14. 50 mm. Black carbon bezel. Blue dial with black hands and index hour markers. Luminescent hands and markers. Scratch resistant sapphire crystal. Water resistance to 100 meters. Two tourbillon balances responsible for time keeping and chronograph functions located at the 8 and 10 o'clock positions. Chronograph power reserve indication located at the 12 o'clock position. Chronograph minute