Perry & I were thinking some type of prototype "Yukon" but it is too many years beyond the #20's inception. I think it was ordered by a customer for specific task, probably surgically cutting around the anus of a critter and then having a decent amount of belly to allow for fast, easy skinning! It would only make sense that a "one-off" sheath was needed as it would have rattled around pretty good in a standard #20 sheath. Old Maurice did a good job...I think! Glad ya'll like it. I do too!
Stay sharp, Capt. Chris