Contact the maker
Old gun catalogs and magazines.
A rapier (sword) and a pistol (gun) that's all the info gives
It would tell the year when it was produced.
Inexpensive.
Blue Book of Gun Values
We need more info to make an informed guess.
Blue Book of Gun Values
Sorry, cant help with that limited info. Conact Browning Customer Service at link below.
Your question spans 100 years, and thousands of different guns. Good questions get good answers. We need info to get you info.
Contacting Colt and getting a letter would be a good start.
Nothing on the net
Blue Book of Firearms Values, Standard Dictionary of Firearms.