Model #: 503 CHRONO Material: Stainless steel Strap: Third-party black leather belt, buckle Machine type: Automatic Winding (25 stones, with Hand Wound, with hack function) Waterproof: 3 ATM water resistant Function: Chronograph small second Dial: Blue Case size: Diameter 40 mm (excluding crown) Strap size: Arm circumference (inner diameter) maximum 19 cm (7.48 in) Lug Depth: 22 mm (0.87 in) Accessories: None USED item There are no scratches on the glass. There are some stains on the hardware parts of the hands and dial indexes. The main item of the watch has scuffs and small scratches all over, and there are also minor scratches on the bezel. The belt and buckle have been replaced with external products, but there are scuffs and stains. 4 to 5 seconds per day (measured with a timegrapher placed flat) The daily difference may be large due to the usage environment and posture differences. Please consider these values as reference values only. All items listed are one-of-a-kind items.