That's very possible. I remembered seeing this photo in one of the links above:
View attachment 1386091
This double-end wrench also has such marks, but take a close look at them. On the double-end wrench, you can see that the lighter-colored circle surrounding the hole is not even all the way around. On your wrench, all of these lighter rings are even. That tells me that the marks on the double-end wrench were made by hand using a punch and hammer, while the marks on yours were most likely made by a machine set at a certain load.
Last night, I simply thought these marks were ID marks from a previous owner, as I, too, have marked tools using a hand punch. Never really noticed until now how even and consistent the marks on your tool are.
Also, if the wrench were going to break anywhere, it might most likely be at that point. So having the correct hardness would be crucial there.
I'm very much beginning to suspect that your particular wrench was never sold on the open market, but was taken home by an employee of Crescent - maybe even one of the tool designers or, more likely, one of the testers. Once marked like that they could not have been sold.
EDIT: Keep in mind that 24 hours ago, I simply looked at this wrench and scoffed, assuming it was "just another old wrench". So don't take MY word for anything!! Contact Crescent and ask them! ...Might even want to include a link to this thread as it may help somewhat in clarifying some of this tool's mysteries - and history.