No serial number provided.
1958
without the letter 'j', made about 1966
Trooper .22 cal ser 71226 was produced in 1968 (67500-80799)
Colt data at Proofhouse.com
You will have to call Colt with the sn to find out.
You will need to call Colt.
You must call Colt to find out.
You will have to call Colt and provide the serial number to find out.
No such model in the Colt line.
Proofhouse.com has Colt sn tables. You can also call Colt and they will tell you.
about 1914
1995