Just dug this out of some stuff I never cataloged or put away.
I’m guessing it’s some sort of unheadstamped inside primed flare or pyrotechnic round. It has a slightly necked brass case with a brass tube insert. The brass insert can not be removed.
The top wad is missing and any pyrotechnic material or what ever has been lost.
Case length: 19.19
total length: 43.67mm
Any thoughts as to what it is and who made it?