Well, Rob, your 118 is not a toolbox queen. But also not a safe queen.
I paid for my two two line stamped 118s a lot less than 100 USD each.
You may send the knife to Buck for a SPA treatment for a few Dollar.
That will increase the value notable. Or you use the knife. It is a good
user, just because of the 440C steel.
The sheath looks correct to me for the knife. Yes, there are some of them out
there without a number on the backside. But also the stamp may be worn
out and is badly visible. the imprinting is mostly below the belt loop, but
some ot this sheath have it above. and a few number has it just behind the
Loop. This sheath was also used for the 103 skinner for a time.
Haebbie