It's a midcentury Old Hickory skinning knife, ordered by Shapleigh to be stamped with their name. Lots of knife makers sold generic knives to butcher suppliers, grinding companies, hardware stores. Dexters, Russells ect... cast iron cookware companies like Wagner/Griswold did the same, to be sold for less.
It's not worth a lot of money, might get 20 to 30 bucks. I've sold the couple of Shapleigh knives I've owned with any old hickory or forgecraft.
It's worth much more to you as a cool knife to use, easily gets razor sharp.
I recently sold about 50 carbon steel knives, extras from my butcher boxes, still the box is full of my more favorite ones.
Kent