Nice box, Brian! Still too small for my approaching Master Set level orphanage (see Pic 1), but sooooo jealous. Love the Cornwell Man! And look, not just FORGED AND HEAT TREATED, but
PROPERLY FORGED AND HEAT TREATED!
I haven't done any definitive research on that stylized mechanics-cap-wearing C Cornwell Man as a logo or trademark, and I don't remember if we 'carbon dated' him on TA, but he doesn't appear in the 1941 catalog, and he
does appear in the 1946 catalog.
My guess would be that was the introduction - that catalog (No. 26) was a
major publication for Cornwell. Like the 1947 Williams and a few other immediate post-war catalogs I can think of, it was like a re-debut. There was a 2-page "Foreword" and a 4-page "Heart-to-heart chat with our customers..." that starts off with a patriotic look back at the reasons for their growth and production superiority during WWII, and then moves into an illustrated (12 photos) and narrated "tour" of the factory, from the die room, to forging, to grinding, hot-broaching to tempering and hardening, to shipping. Then a 1-page guarantee followed by a page listing the addresses of their "coast-to-coast distributors." (I count 24 states.) That in comparison to the No. 21-A (1941), which discusses their standards, and includes a statement of their guarantee with a photo of the factory all on a single page. But that's just conjecture.
EDIT: The early concept of the Cornwell Man was an illustration of an actual mechanic wearing a cap. See MR. X's post on page linked
here.