I posted this in the SPS but it probably is more appropriate here.
Here is a pair of early 116s. One a BUCK 116 (1963-1966) and the other a BUCK* 116 (1967).
It is interesting to note that even between the two knives there are significant changes.
Note that the earlier BUCK does not have a bevel at the top of the tip whereas the BUCK* and all later 116s have that bevel.
Secondly, the earlier BUCK blade is .083 in thickness and the BUCK* is much beefier, micing in at .116.
Note also, that the blade grind is different.
I do not have the fabled barrel nut 116.
IMAFRITZ pointed out that the very early 116s
were probably reground 118s.
I have laid a BUCK 116 on top of a BUCK 118 and you can see that the 118 can be ground down to the size and shape of the 116. There is one difference which I did not photograph and that is the fact that the guard on the 116 is both wider and longer than the 118. If it were the other way, it would make sense. I can rationalize it by saying that, since those early knives were essentially hand made, the difference can be explained by a simple variation in grinding.
Here is the 116 on top of the 118.
Telechronos

