20 X 82 French helicopter round

[SG500]

Attached are a few photos of a recent addition to my collection.
Based on the German MG 151/20 this is French and is a helicopter round.
INERT etc.
Any further information would be appreciated.
Thanks.
Dave.

 

[TonyE]

20mm MR

You need the new book on Manhurin cannon production, Dave. See the current ECRA Journal.

Regards
TonyE

 

[SG500]

Yep, saw that in ECRA, may well go for it.
Thanks Tony.
Dave.