Produced circa 1942. size 16s, model 5. Case marked: Keystone/Base Metal/771185 on interior, the back of the case is extensively marked with manufacturers information. Good working condition. Has glow in the dark watch hands and numbers (although they did not glow for us). Light overall wear, consistent with age. Has leather strap and Caterpillar watch fob from John Fabick Tractor Co with locations in Missouri and Illinois.