The Crescent Arms "Empire Hammerless" double barrel (20 guage) is not a collectable gun, but is a "shooter". Thus, in shootable condition, it is worth about $200. That's what I paid for mine, strictly for bird hunting.
50-100 USD or so
Empire Arms was a trade name sold by Sears Roebuck. If it has the Crescent name on it, it would date from about 1893 to 1930. If it has open hammers and damascus barrels, it is more likely to be an early gun. Hammerless guns and fluid steel barrels were introduced about 1907, but sidehammer guns were not discontinued.
It is only worth what the person buys it for...
Will have to be made. Semi-inletted stocks for Crescent Hammerless shotguns can be had for around $40, but require quite a bit of expert work to finish.
The Worthington was made by both Crescent and Stevens for George Worthington Company of Cleveland. Value is about $100 to $150, depending on condition and originallity
My Crescent "Empire" cost $200 as a shooter. The serial number is 7787. These are not collectable guns, but mass marketed "shooters". Still works fine!