The Panerai Luminor 1950 3 Days GMT 24H Automatic Acciaio, model PAM00531, is polished steel on a personalized leather strap with a trapezoidal brushed steel buckle, supplied with an interchangeable strap, a tool to change the strap, and a steel screwdriver. The watch features a black dial, date at 3 o'clock, seconds at 9 o'clock, a second time zone, 24h indicator on the edge, a power reserve indicator on the back, and luminous Arabic numerals and markers. The case measures 44mm, fitted with a brushed steel trademarked lever device which protects the winding crown. The Panerai Luminor 1950 3 Days GMT 24H Automatic Acciaio has a 2.6mm thick sapphire crystal, see-through sapphire crystal case back, anti-reflective coating, and mechanical movement with automatic winding Panerai P.9003 calibre. Power reserve of 3 days. Water Resistant to 30 Bar / 300 meters.