This is a very interesting thread. It is an education for me to see so many fine and unusual knives.
Unfortunately, I was never a big collector of sharp things, however, I do recognize quality and craftsmanship. Consequently, I have picked up an assortment of knives over the years. Here are a few of my (pre-70's) sheath knives:
Marples Hunter w/ Hex cap
Buck No. 120 together with a Puma (White Hunter). I bought the Puma in 1968 when I was 16. Not my favorite knife (but it was my first).
Pair of Hoffritz knives. An early multi-tool knife and a sheath folder
I picked this up at a gun club swap meet last summer and I have no idea of who made it. It is not marked, but it obviously a fine piece of work.