Thank you for the number. From what I can see, it has the blade marking of the early Buckmaster. I wouldn't expect a true prototype to be stamped with production markings.
Check out an earlier post to this forum with a picture of a Buckmaster prototype:
http://www.eazyforums.com/forums/showthread.php?t=81
Joe Houser at Buck Knives told me that this was only the second Buckmaster prototype he'd ever seen.
________
how to roll a blunt