1897. IMO, worth spending the money to get it lettered by Colt
Based on proofhouse.com ,that bisley was made in 1913.
Made in 1911.
about 1902
Colt has never made a 45/410 pistol
A Colt Bisley with that serial number would be 103 years old having been made in 1907.
AFAIK, Colt never made a single shot pistol
About 111 years old, made in 1899.
10-10000 USD depending on specifics.
You will have to call Colt to find out.
made by colt in 1918................
If you call Colt they will tell you when it was made.
1974