I mentioned this 48 Newhouse a few replies above.
I got this from a guy who had been a Washington State beaver trapper many decades ago.
Prior to 1963 the only guys who could trap beaver were certain trappers who were issued 48's, trapped beaver for the State, and sold all the beaver they caught to the State for $7 each. Many of these trappers caught large numbers of beaver, they had very strict standards for put-up; these guys pretty much taught us what we know about clean skinning and a nice finishing job.
Of course this was a money making deal for the State Game Department...until it wasn't.
It was retired several years ago.

I retired a Helfrich 750 Wolf..

A collector offered me a big pile of money for it so I quit using it,1991,,, should have sold it