SPECIFICATIONS Case: 316L Stainless, amalgamated w/ 1936-1945 B-17 Flying Fortress DNA Movement: Citizen Miyota OS10 Chronograph, with 24hr indicator sudibial Crystal: Hardened mineral crystal with Diamondfx coating Case Size: 44mm Strap/Bracelet: Leather, 22mm bandwidth Water Resistance: 50M Certificate of authenticity included DETAILS The Boeing B-17 Flying Fortress is a four-engine heavy bomber aircraft developed in the 1930s for the United States Army Air Corps (USAAC). Competing against Douglas and Martin for a contract to build 200 bombers, the Boeing entry outperformed both competitors and more than met the Air Corps' expectations. Although Boeing lost the contract because the prototype crashed, the Air Corps was so impressed with Boeing's design that they ordered 13 more B-17s for further evaluation. From its introduction in 1938, the B-17 Flying Fortress evolved through numerous design advances. The hardened mineral crystal with Diamondfx coating features 18 layers of UV blocking protection and a scratch resistant diamond/sapphire finish.