Need to know what model before an answer can be given. assuming you are refering to a colt 45 semi-auto pistol the date would be about 1914
Impossible to answer without knowing what model you are referring to.
The Colt 1877 lightning with that serial number was manufactured in 1888,about 121 years ago.
With a letter in the serial number, I doubt if it is a genuine Colt. Probably manufactured in Italy sometime in the 1960s or 1970s.
about 1918
about 1917
Need to know the Colt model.
made by Colt in 1943. Value would depend on overall condition of the pistol............
The Colt model 1908 hammerless .25 with that serial number was manufactured in 1919,
the pistol was made by Springfield in 1914. If the slide read 'colt' it means someone put a colt slide on a springfield 45 frame. Not unusual.
The Colt Challenger pistol with the serial number 2391-C was manufactured in the early 1950s. Colt typically produced the Challenger line between 1950 and 1956, making it likely that this particular pistol was made during that timeframe. For a precise manufacture date, consulting Colt's production records or a Colt historian would provide the most accurate information.
50-400 usd
100-1000 USD or so depending on specifics