20mm Oerlikon Drill round?

[jiipee76]

Here is my latest finding.Is this one really Altdorf/Swiss made Oerlikon drill round?

Has brass made driving ring and primer hole have rusted iron screw.Projectile have O stamp.Casing has roughening on side near base.Casing has stamps: A , 40 , O , 2

 

[kahu1]

Not Oerlikon(no rebated rim), its Hispano.

 

[jiipee76]

Not Oerlikon(no rebated rim), its Hispano.

(20x110) Hispano HS 404 ? What does stamps are? A = Altdorf/Switzerland? O= ? 2= ?

 

[kahu1]

I have a similar case(with engraving on the side), in a thread from 2009 it was ID'd as a Swiss manufactured case for the Swedish Army(M/41) and Air force(Hispano).
Does your case have any engraving on the side?