Made about 1904.
serial # 56649
I don't know exactly what model, but it would probably have been a Colt Single Action Army model.
Blue Book of Gun Values will help.
A Colt single action 1860 army with that serial number was made in 1866.
Your colt single action army dates to 1881 with the serial number you provided.
Army special & officers model officers model special single action army & bisley revolvers police positive .38 bankers special police positive special & detective special
50-300 usd
If it is Colt single action army, then it was made in 1889.
eBay
If this is a Colt single action army, it was made in 1874.
Look on the frame
This is a handgun, either revolver or automatic, which requires manual cocking of the hammer to fire the gun. Examples include the Colt Single Action Army (the classic cowboy gun) for revolvers and the Model 1911 for automatics. A double action pistol will cock the hammer and fire the gun simply by pulling the trigger.