Original U.S. WWII-era 20mm dummy round, headstamped “DPS 1943 20MM M21A1B1.” Manufactured in 1943 by Defense Plant Services, this round was used for training, feed testing, and function drills with 20mm aircraft and anti-aircraft cannons such as the Oerlikon or Hispano-Suiza.
The casing has a drilled hole and no live primer, confirming its inert/dummy status. An authentic collectible piece of WWII ordnance history.
Headstamp: DPS 1943, 20MM M21A1B1
Inert – safe, no live components
Approx. length: ~6.75 inches
Condition: Very good, light patina consistent with age.
A great addition to any militaria, aviation, or WWII ordnance collection.
