Not an insulator but...since we are all collectors of some sort maybe one of you can help id this specifically.

My father had this for as long as I can remember. I'm 53.

I have looked online for another to no avail. This is unique in size (maybe the smallest) and comparable finish compared to other minature cap guns by ATOM. It maybe a pin type? Shown (closed and uncocked)

Pic 2: [id=312243439]