I happen to have one Popplecop. - I think it cost $69 and change in 1970. I have seen one since,.. at a gun shop that was being worked on. There is one for sale in fair condition for about $385 on one of the gun auctions. According to my owners manual there was two grades. One had an engraved receiver and the other (like mine) as a baked on black finish. Sorry for the late post I just ran across this.
james