You will have to be more specific... there are a lot of firearms companies and manufacturers called "Keystone". Got a city/state where they operated? Anything?
The web address of the Keystone Natural History Preservation Foundation is: https://www.facebook.com/pages/Keyst
No sn data available.
The address of the Keystone Natural History Preservation Foundation is: 517 Saint Joseph Street, Lancaster, PA 17603
Louis A. Garavaglia has written: 'Firearms of the American West' -- subject(s): Firearms, History 'Firearms of the American West, 1803-1865' -- subject(s): Firearms, History
Hugh Pollard has written: 'Pollard's history of firearms' -- subject(s): Firearms, History
Firearms safety, ethics, responsibility, history
Arthur Merwyn Carey has written: 'American firearms makers' -- subject(s): Firearms industry and trade, Firearms, History
Crescent Fire Arms, sometime between 1893 and 1932.
Wautauga was made by Crescent Firearms. It was a trade name. Crescent waas in business from @1893 to 1932
Albert Henry Rogers has written: 'Firearms of yesterday' -- subject(s): Firearms, History
Keystone firearms were made by the Davenport Firearms Co. in the late 1800's. They were, I believe, inexpensive guns made to be sold either by mail order or through your local hardware store. Unless it is in very very good condition it value would probably not be more than $150 or so, and then only to be used as a wall hanger. One should be very careful about firing any damascus barreled gun, this is especially so with inexpensive firearms from that era.
No known published data. No.