Degree used ab *About product rank s Very clean product like new a Clean product with hardly noticeable flaws ab Clean product with some scratches b Product with minor flaws and signs of use q Vintage/antique product Drive Automatic winding Material ss Dial Black Case Diameter / Thickness 40mm / 15.5mm Wind protection Sapphire crystal Water resistance 20 atm Lug width Around the wrist approx. 19.5cm Accessories Box, Warranty Card (authorized in Japan, July 2012) This is a self-winding chronograph model from "guinand," a watch workshop newly established by Helmut Zinn, founder of the German watch brand "Sinn," to embody his watchmaking spirit. It is the successor to the famous Sinn.155 chronograph, which was delivered to the German Luftwaffe. There is a small scratch on the lug at 1 o'clock and a scratch on the bezel edge around the 34th position of the scale. There is some corrosion on the middle of the buckle. There are some light scratches and scuffs from use, but no deep scratches that stand out. There is a dot scratch on the glass between 1 o'clock and 2 o'clock. The watch was purchased at an authorized domestic retailer.