This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Japan
ARMAMENT-Ammunition
20mm type HO-5 armor-piercing tracer for army aircraft synchronized (Browning type) guns.
3-D: 14.6 x 2.5cm (5 3/4 x 1 in.)
HAZMAT: primer (possibly)
Brass
Copper
Steel
A19761409000
Gift of John Schmitt.
National Air and Space Museum
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