I have several of these blanks all with different headstamps and cannot make an ID. The blanks have natural wood bullets with live primers and powder in the cartridge. I don’t know if these are exercise blanks or grenade blanks. There is an overstamp of a circle on the headstamp which I assume means the case was reloaded. Please see below photos.
Can any of the experts ID this blank, its purpose, and when they were used? Were they made and used by Nazi Germany or were they used after WWII?
Thanks for any information.