Mens B-17 Flying Fortress WWII Bomber Aircraft Military DNA Grey Dial Black Strap 04A The innovative designer incorporates the metal "DNA" from the authentic WWII B-17 Flying Fortress Bomber Aircraft into the round stainless steel case. A Japanese Miyota OS21 Quartz Chronograph movement beats at the heart of the timepiece, with accuracy of +/2- 20 seconds/month 316L stainless steel Genuine Leather Strap Certificate of Authenticity