You need the services of a professional appraiser like Kopec
about 1917
if you are taalking about a single action ??? made 1910
about 1966/67
10-1000 usd or more depending on specifics.
NOT much difference. Shikari was made before 1986 - single shot, hinged breakopen "shotgun" style action, with single action exposed trigger - 1871 Buffalo rifle made after 1987 - same type of action and transfer bar safety system - both chambered for .45-70 Gov't Cartridge.
Try Colt customer service here: http://www.coltsmfg.com
Inchgower Single Malt was created in 1871.
made about 1885
1871
1871
made about 1907
500,000