Thanks for the pictures that helps a lot.
That knife is called the Executive Lockback and it is part of the Image XX Outdoor series from the year it was made. It was made between the years of 1990-1993. That is the four years they used that blade stamp. The exact year it was made is stamped on the blade the first 2 numbers are on the left side of USA and the other 2 numbers are on the right side an example is 19USA92. I can't make it out from the picture it is too blurry.
What that blade stamp actually says is:
CASE XX
Bradford, Pa.
19 USA 9?
Whatever the last number is 0,1,2,or 3 from the year it was made. It looks like they messed up on the Bradford, Pa. stamping because it looks unreadable.
I hope this helps you out.