Re: J Cooper Double barrell shotgun
Welcome to the forum. Your sXs shotgun may be worth anywhere from $25 for a parts gun to over a grand. Value depends upon condition, origin (who, where and when it was actually made) and some other factors.
Post some in focus pics if possible, including the bottoms of the barrels and the watertable showing any markings, sides of receiver/frame and anything stamped on the barrels. If you can't post pics - describe what you see in the above places, then describe the condition of the metal and furniture (0% finish to 100%)- stock: not broken, checkered, no scratches, original butt plate, etc.
Jim Hauff ~ H&R Collector In Memory of Bill Goforth and Jim Ritchie