CHRONOSPORT CS-31.HS-01 Hand-Wound Wristwatch GUINAND sinn Mechanical Watch Ref.No: CS-31.HS-01 Case Material: Stainless Steel Belt Material: Leather Dial Color: Black Movement Type: Hand-wound Case Size: Approximately 42mm Lug Width: 22mm Water Resistance: 10 ATM Daily Rate: Approximately ±20 seconds Accessories: Main unit, original box, guarantee card (2006 domestic authorized dealer) Condition: No scratches on the crystal or the case back. The case has only minor scuffs from daily use, with no noticeable major scratches. The belt has some widening of the holes, but is in relatively clean condition. Overhaul history is unknown. The watch is stopping at 0 seconds. Backlash is about 5 seconds. *All images are of the actual watch. *Serial number is hidden. CHRONOSPORT is a brand created by Helmut Sinn, the founder of sinn, after he sold sinn, incorporating his own watchmaking philosophy. Manufactured by the current GUINAND company, the movement, belt, and buckle are stamped with the GUINAND logo. A unique feature is that when the crown is pulled out, the second hand moves to the 0-second position and then stops. This is a rare watch that was only manufactured for a few years. Recommended for fans of Helmut Sinn, as well as those who like rugged aviation watches such as sinn.