The Koppel 307 automatic chronograph pays tribute to the original, discrete design created by Henning Koppel back in 1978. The chronograph brings new functionality to the traditional Koppel watches while preserving the model's elegant and sophisticated style to perfection. The Koppel 307 is a Swiss Made watch with self-winding mechanism and 42 hour power reserve. The 41-millimetre case is crafted in stainless steel with a sapphire crystal on both front and back. The watch is fitted with a black alligator-embossed calfskin strap with a luxurious steel butterfly buckle for ultimate wearing comfort. Strap size Large is mounted on the watch. Other straps available for additional purchase: Black alligator. Straps for Koppel 517 and Koppel 519 can also be used for Koppel 307. Swiss Made. Type: Automatic chronograph with date. Movement: ETA Automatic 2894. Case: 41 mm, Stainless steel. Crystal: Sapphire. Dial: White laquered. Strap: Black calfskin with steel butterfly buckle. Thickness: 13.20 mm. Water resistance: 3 ATM. Launch year: 2008.