Steel Chronoswiss Grand Regulateur model reference CH6723. Caliber C.673 Hand Wound movement. Approximately 46 hours power reserve. 17 jewels. Case 44mm diameter, height 10.6mm. Solid silver (925) dial, central minutes, small hours at 12 and small seconds at 6. Thermally blued, hand-finished steel hands. Sapphire crystal case back. Water resistant to 3 atm. Black leather strap with pin buckle. Box and papers. Our reference number S21465.