Mystery magazine???

[Flying10uk]

I have this mystery mag which I have no idea for what it's intended for other than it looks to be for a smg of some description and it appears to be for use with 9mm pistol rounds. I purchased it at a show because I thought, working off memory, that it looked like it could be suitable to display with my U.K. deactivated Hotchkiss smg but as soon as I got home and compared it, I realised that it's not. It didn't cost a great deal of money and so I'm not out of pocket but I am very curios as to what application it's for. It doesn't appear to be for anything common that I've seen before and the profile is almost triangular.

I am open to any thoughts or ideas as to what it may be for. Thanks for any information and help.

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