The handle patterns are visible on the 420s shown in the 1944 catalog.
The grip pattern is visible on quite a few of the pliers in the 1944 catalog, Don. But only the early arrow flight pattern. The one with the many broken lines. We know those are wartime up through at least 1944.
I am asking about the later arrow flight pattern grip. It does NOT appear on any pliers in the 1944 catalog, as far as I can tell, nor would it, unless they were using both patterns at the same time, which I doubt. That's why I consider all those pliers postwar. Do you have pliers with the later grip that also have the 1933 CAN. PAT date and the 1934 US patent number? I don't.
So, what I am wondering is...
(1) when they transitioned from the early broken-lined arrow flight pattern to the later arrow flight pattern, and
(2) when they stopped making pliers with the later flight pattern grip altogether
In other words, I think all the pliers with the later grip were made after 1953. But until when? How much later could some of them be before they started putting plastic, composite, or rubber grips on them?