~9 mm aluminium case [?]

Hi,

for ID: strange aluminium “case / rimfire” [?] / with groove near rim. (Or German detonator alum. cup?]
Dimensions similar to 9mm Knall, or 9,5 mm PL made. Found in one fort in Warsaw, looks like a prewar/war period.

Only for comparison - 9x17r with rare h/s.

Regards,
PM

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