You have already identified it as a Shapleigh's King Nitro. Shapleigh Hardware was in St Louis Missouri from the mid 19th century until the middle of the 20th. Their King Nitro guns were manufactured by W.H. Davenport and later by Stevens/Savage.
I HAD AN OLD GUN SIMILAR TO THE ONE YOU ARE TALKING ABOUT AND IT WAS MANUFACTURED BY A COMPANY CALLED SHAPLEIGH IF MY MEMOERY SERVES ME CORRECT Is it a windmill or possibly the Perone, an oblisk similar to the Washington Monument? That would be a Belgian proofmark. Shapleigh was a hardware wholesale/retail business that had its tradename guns manufactured by several manufacturers. "Nitro" would indicate the gun could safely fire the smokeless or white powder which was developed around 1900.
The best that I can do is say that the Lefever Nitro special was made from 1921-1948.
The Lefever was mfg. in 1935.
HAVE IT CHECKED OVER BY A GUNSMITH FIRST!!!!!!!!!!!! It is an old shotgun.
Known tradename used by Shapleigh Hardware. The guns were made by several different manufacturers, although your double is probably a Crescent. 1900-1930.
older than you
Your shotgun was manufactured in 1923, by Ithica Guns which took over the Lefever brand when they acquired the corporation in 1916.
The shotguns were manufactured by Ithaca from 1921 through 1947. Yours was manufactured in 1928.
My Triumph shotgun is seventy-six years old.
You have to be 18 years old, to legally own a shotgun.
I can say that the LeFever Nitro Special was made from 1921-1948.I do not know if the serial numbers by year of production are available in the public domain.You may have the Grade A field model due to the engraved ducks on the side.These were made from 1934-1942.Barrel length was available from 26in.-32in,of which your shotgun fits.
Based on the serial number, your shotgun was manufactured in 1923. Without knowing the condition and other options, a value cannot be determined,
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In England you must be at least 14 years old to obtain a Firearms Certificate which allows you to own a shotgun. A shotgun can be obtained under the age of 14 with a Shotgun Certificate signed by a parent.
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This shotgun is in the neighborhood of 100 years old. There is fairly extensive information online available on this shotgun.
Nitro King was a trade name sold by Sears Roebuck and H&D Folsom Sporting Goods. Manufactured by Crescent Firearms, Norwich, CT, c. 1905-15. You can invent any history you want for the last 90-100 years, 'cause no one was keeping track of it. It most likely has fluid steel barrels and could still be used as a field gun, if approved by an experienced gunsmith. But if it has a side-hammer, it probably also has a twist-steel barrel and should be a mantle decoration now. Should be worth about $50-$75 for either use.