A lot of what is generally accepted as fact on the 122/124 was based on theories about the evolution of those two knives. I am not knocking those alleged facts, especially since i started most of the rumors!
This is what i think happened, and this represents a change. I think the very first nemos/frontiersmans, stamped BUCK, U.S.A., had the bone hard fiber spacers. At that time, 1967, all other Bucks with black phenolic handles had these spacers. It stands to reason that we would have done the same on these noe models. After some production got out, maybe a year or so, we started getting them back rusty. We experimented with the white teflon spacers but quickly abondoned that idea. I believe we went back to bone hard fiber and then, in 1969, we went to red micarta, like all our other knives in the line. Of course the next variation was the slab micarta without spacers.
We have a Nemo, in the early style sheath, that has bone hard fiber spacers and this supports the above theory. If you want info on early/later style Nemo sheaths, let me know.
I hope this helps. Oh, by the way, whichever order the white teflon one came out, it is still the hardest to find, especially in the box! Wow!