20mm cannon shell for id please

[Rrickoshae]

Can anyone identify this 20mm round for me please? The case length is 121mm and the proj., if it is original to this case, is similar to an Oerlikon shell. The rim is thick, similar to a Madsen but there is no headstamp. There are no markings to the fuze or proj.
any thoughts!

thanks Dave

 

[rigby]

For me it's a regular 20mm Madsen.

 

[Rrickoshae]

Yes, I was of the same view apart from the absence of headstamps - I don’t recall ever seeing a standard Madsen without a headstamp

 

[Hoeksel]

20 mm Madsen without head stamp is actually common, and typical for Belgium post-war.