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Re: [Weapons] shell case

Posted By: Steven Zolla
Date: Sunday, 13 April 2003 2024 hrs. EDT

In Response To: [Weapons] shell case (Erma)

M21A1 stands for Signal, ground, pyrotechnic
1944 is the date of manufacture (WWII)
20mm is the nominal size of the round
SMC may be the manufacturer's mark

It appears this is a tracer round for a 20mm antiaircraft heavy machine gun.

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