My name is Jon. I will do my best to help. Do you have any photos of your Colt?
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According to your serial number your Colt was made in the 1877-1878 range making this an early model made for Black powder cartridges. I can confirm this with the screw if the front of the frame that retains the cylinder pin. This feature is not found on later models. It appears that this model is probably a "Late Military Model". The stamping on the grips and the lanyard loop at credence to this theory. Due to the high value of this firearm, I recommend consulting someone who specializes in antique Colt revolvers. I recommend contacting David Condon Inc. at www.davidcondon.com. To give you an idea of the value your revolver could be worth, here are the prices listed in the Standard Catalog of Firearms. Prices are listed by condition.
I hope this information helps. Please remember to rate this answer using the stars. Thank you and have a great day.
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