I was told when I bought this cartridge that it was an early Winchester 12 ga. experimental plastic shell. It has no headstamp. It is a rolled crimp over a tan top wad with “8” in black stamped on it. It is 1 11/16 inches long. It is all plastic, including the head. There is an insert of either black plastic or black non-magnetic metal in the head. It has a standard battery cup primer with a copper cup and a brass primer.
I have had this cartridge since the late 1960’s or early 1970’s. I would guess it was made in the mid-1950’s.
Does anyone have a positive ID or other information on it?
Here is a poor image. It is the best I can do.