I wanted to check a few things out on this Oregon-found knife before I posted it, but here it is. It is stamped Buffalo Cut. Co, but is obviously a product of Schrade Cut. Co.
It is a wondrous and spectacular piece, a mere 4 1/2" long

. The pen blade is longer than some Jack knife main blades!

An acre of beautiful peachseed bone makes the handles, and what appears to be an inverted Diamond Edge shield is inletted and pinned into it!
It has some wear, and someone cleaned it - a bit more respectfully than most have been done. I wanted to CF and CE it for a while before I decided is was original, and I've decided it appears as I've described. I've stayed awake a night or two over my kids - I never thought I'd do it over a knife!!

My guess is, it was made after Schrade took over the Shapleigh knives that Empire was making up until some time in the 1920s. Buffalo was in business until ca.1939 according to Goins.
I was born in Buffalo in 1944, so the knife holds a bit of a connection for me, though it is a bit older.