Joe,
It's not a Model #22 and the back of the sheath was designed like that by Maurice Johnson to be worn horizontal or vertical. It's a Model #3-4" with #6 grind! It is 1/4" stock.
Below is mine out of The Captain's "STASH"...just for this reason: To show everyone what it is. Price on the back of the blade of $4600.00 may tell you from whence it came! I paid less than a third of that "BUT" (There's that word again) it is fairly rare, at the very least quite scarce!
Stay sharp, Capt. Chris
PS: Mine has 7 spacers...CCS