It is a never ending learning process!
Spey blades, substituted by a pen blade, or, the blades are positioned in differing positions.
Some manufactures place the Large blade in the middle, others the Sheepfoot blade.
I am and have been attracted to the Stockman pattern, a Camillus model 66 was my 1st that was a pawn shop find. Then inherited a Uncle Henry Staglon, from FnL. Just a tad shorter.
Then found two Buck 301s at a Gun/Knife Show.
Then wished I could find a Clip point/Sheeps foot model as the Spey blade was not needed daily.
Then Buck introduced a new Buck of the Month. A Stockman, Micarta scales and 2 blades.
The chase never ends, be prepared to learn…