French Blank 50 Mle?

I’ve had this in my metallics collection for a while now and wonder if anyone could identify it for me and what is the intended purpose ?

9mm is for size comparison

Thanks in advance

This is a propelling charge for the 50mm mortar model 1937.

Actually this is a commercial harpoon propelling cartridge which was made from surplus 50mm Mortar propelling cartridges.
French mortar propelling cartridges had no star crimps.

Yes, it was discussed back in December 2018.
Here is my box.

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