You need the assistance of a gunsmith.
A nice pistol
50-250
value depends on condition
LR stands for Long Rifle which means the pistol uses a .22LR caliber bullet
That Colt frontier scout was made in 1959.
1959
Not recommended.
100-400
Your colt frontier scout K model was made in 1961.
A Colt frontier scout with serial number 127580F was made about 1960.
@1967
Made in 1958.