Really nice Hamilton 4992B, 22 jewel military. Watch is in very high condition with all markings on back. Just serviced and running perfect. Ordinance marks on back: AN 5740,Mfr's. part no.4992-B, Serial No. AF-42-12232 (low number) , Contract No.W535ac-28072  , Hamilton Watch Co. Very nice all original 24 hour GCT with hack set 4992B with 22 jewels...serviced and running perfect. Early war production (1942).