Chief,
While there may be some validity to what you have mentioned, there are numerous...and I mean "quite" numerous examples of the fact that a good amount of differentiation stems from the craftsman himself. Examples. just in the 5 I just posted, i.e.:
* Fireman Special
* Model #16
"Both" require the most strict qualifications, as the "exacting" measurements of any and all RMK models. I have had handle material rejected..."many times" for variances, almost unrecognizable! (1/32" and so on) Check out the "teardrop" (if you will) appearance of the Fireman's butt, compared with the Divers. "&"...both were made in the same time frame. Welcome to the world of custom knives. It's that simple.
Best, Capt. Chris