Dave, this was on the auction on the bay....
551- ...
One of a kind Custom Made, Rare and collectible Buck Knife. This knife was designed and built on 551 model size and shape platform.
Features beautiful European design handle (front bolster only). Stainless handle is hand scalloped and inlayed with wooden scales on both sides, contour shaped and high luster polished along with bolsters to a mirror glare.
2-3/4" Drop point blade, Mirror polished and made of full rust proof, 425 stainless steel.
Stamp on the blade: BUCK (in calilgraphy) CUSTOM USA. This is one of a kind knife, which was made in 1994 in Buck's custom shop
I kept it as part of my collection on the plaque.
Overall measurement when closed: 3-7/8"
I know that it not one of kind... Because I have two of them now... I'm not sure what you have.... ITE