HEY! I Have One of Those!
Inherited it from my great-uncle Fred Coats, who died sometime in the 1950s. Mine is a twelve-bore, with LOONG barrels, bored full and modified, and external hammers.
I'll be interested in just what kind of information you get from other members. I'll bet Nitro Hunter is one of the products of American Gun Company, people who made up modestly priced shotguns for hardware companies and chain stores and anyone else who could afford to order a few hundred copies. The time frame you mention is about right, too--If production wasn't a little earlier.
Uncle Fred and Aunt Maudie had a decent-size farm in Jefferson County, Oklahoma, a few miles north of the Red River. I don't remember what kind of a .22 rifle he had, but the old double always stood just inside the back door, uncased. The remaining finish indicates that this was a working farm tool, not something coddled and pampered--Worn gray in many places but no rust on it. There were an assortment of shells on the shelf above. Number sixes were the all around load, with number four, "Blue whistlers," for heavy duty work. Never say any buckshot or slugs, and for some reason never asked him about other loads.
Hope you come up with some background on these old scatterguns.
Johnny