Really nice example of U.S.Army Air corp hack set A-11. Movement a caliber 539  is  like new serial number T 777129 which dates production to 1944. Ordinance ; U.S. Army A.C. ,watch navigation hack, Type A-11 ,Spec. no. 94-27834 B, Ser. no. AF44-96  ,mfgrs. part no. 2114 , Ord.no. W30-053ac-1321 Elgin.Overall condition is very high with patinaed hands and dial . Case measures 31.6 x 39 mm overall and comes with new NATO canvas strap with steel buckle....ready to go!