The top of the board is marked "BUREAU OF ORDNANCE AMMUNITION DISPLAY BOARD MK.1 MOD.0 (VISUAL TRAINING AID)". The board consists of display rounds of 20mm Anti-Aircraft round, 20mm Aircraft rounds, .50 BMG, and other small arms calibers used by the United States Military at the time. Provenance: The Jon M. Maxwell Collection

Very good, some flaking of the black paint background, some oxidation on the brass, some wear from display and use, and some fading of the markings on the display plaque.