BOSS chronograph, reference 1513510. TECHNICAL SPECIFICATIONS Movement: battery-powered quartz chronograph. Functions: hours, minutes, small seconds, 30-minute chronograph, 24-hour indication, date between 4 and 5 o'clock, and tachymeter scale. Case: round stainless steel with silver-tone brushed/polished finish and solid steel back. Case diameter: 44 mm, excluding crown. Case thickness: approximately 11.5–12 mm according to retailer listings. Crystal: mineral glass. Dial: blue sunray finish, applied baton hour markers, contrasting silver-tone hands and three subdials. Bezel: fixed dark tachymeter bezel. Bracelet: silver-tone stainless steel, approximately 22 mm at the lugs, folding deployment clasp. Water resistance: the actual caseback is marked 5 ATM / 50 METERS. Warranty: 1 Year seller's warranty INCLUDED AND PHOTOGRAPHS BOSS presentation box as photographed. All 20 seller photographs show the actual watch. The catalogue image illustrates the same reference and is supplementary. Protective films and labels visible in the photographs have been left unchanged.