REFERENCE: E2RGCP MATERIAL: Black dial in 18K rose gold case with ceramic bezel and PVD case back. Multi-tiered (6 layer) dial, with signature Jacob & Co. geometric sub-dials and hands. DIAMETER: 46mm POWER RESERVE: 48-hour power reserve. MOVEMENT CALIBER: Jacob & Co. 2121 automatic chronograph movement, Incabloc shock absorption system. WATER RESISTANCE: 100 meters FUNCTIONS: Chronograph: 30-minutes, 120 hours, center seconds, date and early seconds.