Hi! I need some info about a knife--A guy I know needed some $, so I bought a few of his knives--One was a Buck 500 with Stag Scales. It is Tang Stamped Buck over 500(AND WHAT APPEARS TO BE AN UPSIDE DOWN V) over USA. He said he bought it in 1988. First---Does all of this seem correct? Second-- Any idea what it may be worth? Knife is super clean and it was in a black sheath,however I didn't think to ask him if it came with the knife or not. Any help would be greatly appreciated!