Question can't be answered. The sn given does not conform to Colt's system. One possibility exists, it could be a special run or custom sn. Call Colt and they will tell you.
If your colt is the thunderer model (you do not say) then it was made in 1902.
Go to proofhouse.com to find year of manufacture and google it for other information.
Colt data at Proofhouse.com
You will have to call Colt with the sn to find out.
You must call Colt to find out.
You will need to call Colt.
If this is the Colt 1878 Frontier model serial # 5100 , then it was produced around 1881.
No such model in the Colt line.
You will have to call Colt and provide the serial number to find out.
Proofhouse.com has Colt sn tables. You can also call Colt and they will tell you.
about 1914
1995