20x(?) DCA France(?) Cartridge, Need Help WIth Proper ID and Informantion

[bdgreen]

The following was posted by "INIMICUS" for ID without results here: https://www.usmilitariaforum.com/fo...95-20mm-shell-1953-id-please/#comment-2807068

So I'm posting it here to see if anyone can help.

Made by Hispano-Suiza (?). If so what is the model designation?

From headstamp: 53 = 1953 (?). 375 = lot number (?).

DCA = Defense Contre Avion

Any information would be most appreciated.

Thanks,

Brian

 

[Chris]

DCA is also known as C.A. Dunham from U.S.A.

 

[rigby]

I think that "Defence Contre Avion" is the right meaning for DCA.
I also think that it is a Swiss dummy with, for me, an unusual headstamp.
I have an early Swiss 20x110 HS404 dummy also with green fired primer and white bullet.

 

[MINENAZ16]

Hello,
Herewith pictures of Swiss cases. Same markings, so I also think it's a Swiss round.
I've never seen DCA (= AA - Défense Contre Avions) stamped on french cases.
On pictures we can see other letters so maybe a code for lot or factory stamps (so maybe no sense for DCA)