Impossible to answer without knowing who made it.
Your Colt K model frontier scout .22 pistol was made in 1964.
the hk69 gl
475-575
The 1959 Colt frontier scout pistol, serial number 48899F is valued at $900 in excellent condition. In fair condition, it is valued at $400.
@ 53 years old
A nice pistol
No serial number = no answer.
100 USD
about 1958
Best to ask a gunsmith for help.
it might be a model from 1975