What is the origin and value of an old Nitro King 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.