Your two posts have been combined....
What do you want to know? This knife is a M9 Bayonet made by Buck for commercial (Non-USGI but civilian sales). The bayonet was made in 1987. All Commercial bayonets of this period have both Buck and Phrobis Markings.
There is more info on the Buck and Phrobis M9s here:
http://m9bayonet.com/buck-phrobis-m9.html
The knife looks to be in good shape to me... There is an identical version of this M9 on the forums here:
http://www.quarterbore.net/forums/showthread.php?t=46 In fact, I have a knife with these same markings in my collection.