Your photos confirm my observations — that the blanks for early tools with designs larger than the shaft were forged, either to make a blank for filing and machining (e.g. the cams) or to create an interior counter to be machined to shape (e.g. the Masonic logo, leaf, and background). I have heard people site the mold lines on the back of the stamp as shown in your first picture of the cam stamps as proof that these stamps were forged rather than hand cut. Your photos prove that in the early days, it was a combination process -- the same cannot be said of current production!
It also explains why I have three #453 cams that if it wasn't for the numbers stamped on them, you would think they were different tools. Two have no prefix letters and one has a C prefix. Two are the same proportions, with one being wider than the other -- but not quite as large as the 455. The other is the same width as the smaller of the two others, but the center is machined out to a greater depth making the contour more narrow. All three have earned a space in the tool case.
I have also observed variations in other tools. One of those is the #206 Pear Shader. One of the variations is tall and more narrow, the other is shorter and wider.
All of this just proves that the earlier tools were hand finished and that standards varied from lot to lot and/or machinist to machinist. In every comparison I've ever made, the early Craftools deliver a cleaner impression than current production.
I bought many of my tools in the "no letter era" and I will stick with them -- they will outlast me! That "dates" me, but after nearly 60 years, one of my favorite things is seeing and feeling a carving come to life as I apply the final decorative swivel cuts.