Joe,
We could go back and forth on these points ad nauseam. We've beat things to death as usual. I'm going to leave this topic with a hoped for enlightenment in response to your statement:
I don't know where I am contradicting myself but I guess you see it somewhere.
I will repeat, blade grinds could be all over the place, all I am saying is there is no way to say that knife is unequivocally a 1939, 1940, 1941, or 1942 knife.
You can see my photos above of the original Zach and the later '42 early '43 knife that also shows the evolution of the blade grind, hilt shape, and handle. Brian's knife was made during this period.
Your denial of facts is a hurdle I face every time we have a disagreement over anything. Enough said on my part.