20mm HS headstamp

[ydnum303]

Hi all,

Seen at the ECRA meeting on Saturday was a 20mm Hispano case with the headstamp AGM-1944 20MM-M21A1. Nobody at the meeting to whom I spoke knew who the maker was. Can anybody here help, please?

Thanks in advance,
Roger.

 

[EODGUY]

There was an AGM code used by the Aluminum Goods Manufacturing Co. of Green Bay, WI back many years ago. You didn't mention the case material. I know they made experimental 20mm aluminum cases, not sure about brass though. There could well be another company that also had the AGM code assigned.

 

[blackwatch]

AGM = Aluminium Goods Manufacturing, Manitowoc, Wisconsin USA,
(on 20 mm ammo)

 

[ydnum303]

Thanks

Thank you, Gentlemen.
The case was brass, very blackened through age, and was recently found by the son of a friend on an old WW2 USAAF base in Lincolnshire.
Roger.