Mike, it's been many years ago...actually late 70's I think...........that I wanted to build some longrifles with 48" straight barrels. I heard about H & H Barrel Works in Maryland (I think) .......and I contacted them and ordered 2 barrels. I think the guy's name was Hoppy Hopkins. Like I say, it's been a long time, but I think maybe that was his stamp.
Haven't heard anything about him since so it might have been a couple of machine shop guys that wanted to make barrels.
I remember they shot really good! Just my 2 cents.............