A Model 1917-1918 Trench Knife made by American Cutlery Company (A.C.C.)
in 1917. This example came with an unmarked leather scabbard which is an
unusual type for this knife, at least in my experience. In fact, this is the first
example I have seen. See U.S. Military Knives, Bayonets & Machetes, Book III
by M. H. Cole, page 24. The condition of this set is extraordinary. The knife still
has most of the bluing still remaining on the blade. The name scratched on the back
of the scabbard appears to me to be "tobias".
From what I have been able to find out, this was a WWII issue scabbard for the trench
knife. Very scarce, I suspect, especially in this condition.