I have one. It was the first bow I ever owned, and I got it when I was 15, in 1981. It is the only bow I have ever harvested a deer with!
Mine is marked KM Special, BP795, on the lower limb belly. #40xx 2 28, but scales at #43 @ 28.
58" AMO. Still in great shape, and shoots as hard as it did all those years ago.
Info was almost impossible for me to find, but as near as I can discover, it was a Hunter model manufactured to be sold / distributed by retailers, rather than dealers, such as Montgomery Ward, Western Auto Hardware, etc.
The man that gave that bow to me told me that he bought it in 1959, from our local, small town hardware store.