Buck Knife
501 Esquire
They changed the name to Squire in 1985
Micarta Handles (changed to wood in 1981)
Integral bolsters and liner are stainless steel
440C Blade with Old English Script
Lockback
I know it is USA made between 1977 and 1988. The reason is they started producing then in 1975 with three pins showing on the handle. The third pin was the handle pin which they cover in 1977 so you could only see two pins in the handle.
Knife is in original factory box
Very shows some scratching-most likely just from being moved around through the years
It really doesn't show signs of use