Cartridge Case (11A09)
This 20mm cartridge case was part of the ammunition for the eight Oerlikon anti-aircraft guns mounted on the the James Eagan Layne. This Mk4 case was manufactured in 1944 by Ecko Products Co, Chicago, IL (1). This case has not been fired and was originally found with its projectile.
On the base of the case is marked: E.K. 1944, 20MM Mk4
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