Longines signed Keystone base metal pocket watch case, 54mm exterior, diameter excluding crown. Will need to be serviced before use. Dial shows some patina and small scratches. Plastic crystal is perfect and appears to be a replacement. I never tried to fully wind it, watch runs for a few hours without forcing the spring.Back of watch engraved with: U. Navigation Master Watch - Type A-9 MFR'S, ASSY. W535AC-14164 SPECIFICATION N0.27783 LONGINES-WITTNAUER WATCH C0. The item "WWII Longines GCT 24 Hours US Army Air Corps Navigator Pocket Watch. Type A-9" is in sale since Tuesday, February 5, 2019. This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Parts, Tools & Guides\Parts\Chains". The seller is "rigatino" and is located in Austin, Texas. This item can be shipped to United States.