No serial number = no answer.
The 1959 Colt frontier scout pistol, serial number 48899F is valued at $900 in excellent condition. In fair condition, it is valued at $400.
To answer the question we'll need to know more about this pistol. Is it a revolver or a semiauto? What model and caliber? I found a Colt frontier scout .22 with that serial number made in 1962.
Depending on the serial number ,between 1970 & 1977 for the peacemaker .22 model
about 1958
Could not find a Colt frontier scout with serial number 56599P, but a Colt frontier scout with serial number 56599F was made in 1959.
The lower the serial number the younger the pistol is
From the records I have, the Colt frontier scout .22 Q model was produced in 1967. (210500F-223199F) about 1967
The PY in the middle of your serial number dates your pistol to 1982.
The Colt Frontier Scout with that serial number was made in 1965.
it might be a model from 1975
No serial number provided.