US KOREAN WAR ERA NAVY PLAYING CARD STYLE “AIRCRAFT IDENTIFICATION” STUDY CARDS, TYPE “DEVICE, 5-E-7b”

US 1960’S ERA 18″ X 20″ PAINTED? ALUMINUM SIGN FROM THE FT. DIX 155MM HOWITZER RANGE, HAS “DANGER” (INTERNATIONAL DANGER SIGN) AT TOP WITH “DUDS” (HAS ILLUSTRATION OF ARTILLERY SHELLS ON EACH SIDE) & “DO NOT TOUCH THIS WILL KILL YOU” AT BOTTOM, EXCELLENT