What are facts about a Newport model wn 12 gauge shotgun?

You still haven't told me what type of shotgun it is, but Newport was a Brand Name used by Hibbard, Spencer, Bartlett & Co, Chicago (1882-1962). If it is a double barrel sidelock with outside hammers, it was probably made by Crescent Arms Co, Norwich, CT. A double barrel hammerless boxlock more likely by J Stevens Arms Co, Chicopee Falls, MA. or a single shot exposed hammer by Iver Johnson, Fitchburg, MA. Regardless of the manufacturer, it is worth $75 or less for a single shot or $100-$150 for a double barrel.