You will have to call Colt with the serial number to find out.
A Colt frontier scout with serial number 127580F was made about 1960.
No serial number given.
@1968
1959
Made in 1958.
1959
1961
Your colt frontier scout K model was made in 1961.
No way to answer without the serial number.
1958
1960
You must call Colt with the serial number.