It is hard to overlook the variations of what I call "the dip" (for lack of the proper term) on the top of the blade just in front of the guard. On Graham's and my #23 it is very shallow as compared to Ron's and Dale's knives. Their Randalls are older and it may be an evolution thing. It is a little hard to see it on the others posted here.

Here is a "fighter style" #23 I have with more "dip" than my gold #23. It is about a year old.