40x56 Grenade cases manufacturer ID


#1

Can anyone ID the manufacturer of a 40x53 Grenade case from the following description: Natural finish aluminium case headstamped only “40x56”, these are the only remaining markings. High pressure chamber base anodised dark green. Boxer primer with nickel cup sealed with green annulus. I know this isn’t much information but this is all I can give.


#2

Any ideas?