I have a few of the .22 Flobert blanks usually used for athletic starting pistols. They have the RWS acorn headstamp, and are aluminium cased. How old are they?
probably not very old. They are still manufactured. RWS is a German manufacture.
Here is their website: http://www.rws-munition.de/en/
You can buy them in the US at least from http://www.22ammo.com/rws.html
Thanks for that. All of these I usually see are copper cased.