What are some of the other markings on the gun? It is most likely a Savage/Stevens or really who knows whose gun but what are the specifics on it who knows. I would say the value is ??? Below are some links that might help you a little bit more. BTW http:/www.google.com can be your friend.
Q: I was wondering if you have any information you could tell me about a gun, that is my fathers..its a Nitro King 12 gauge single shot shotgun. It looks like it has a twisted steel barrel on it..I was looking for any information, or where I could get a quote on how much it would be worth, if anything
A: King Nitor was a "house brand" name used by Shapleigh Hardware Company of St Louis for many years. Circa 1920-1940 their double barrel shotguns were Stevens model 315 but marked with the King Nitro name. Other makers may have made guns for them at different times. Charles Carder's excellent "Side By Sides of the World" is the source of this information. The Blue Book lists the
"Shapleigh King Nitro Savage Model 15"
However, I can't find any info on a Savage Model 15 and there appears to be several models put out by "King Nitro"
Both 'King Nitro' and 'Central Arms Co' are trademarks of the Shapleigh Hardware Co, which was a major catalog retailer from the late 1800's well into the 20th century. The shotguns marketed under that name were made for Shapleigh by different companies, notably Davenport Firearms, Crescent, Hopkins & Allen, and Stevens.
At one time if you paid for the dies, or agreed to buy enough firearms to justify the expense of the dies to mark the firearms, you could have your own line to sell.
The prime makers of these where, Harrington&Richirdson, Iver Johnson, Hopkins and Allen, and Cresent.
Values very, from not much to a little more, most of these trade brand firearms are 50 to 125 years old and need to be checked by a competent gunsmith, to see if it is safe to shoot, after said check the smith should be able to tell you the maker.
But you could also post pic's and some of the others see the piece in question and maybe get a good I.D. from some of us.
I would have to go deep into the odds and ends, enough dust to keep a drug companies allergy med sales strong for a while, but my fuzzy memory banks are wanting to say that a firearm that is in that pile of ________ is marked Bridge Gun Company and that it is a H & R.