At first glance, this socket appears to have the P&C hex around two letters. So it sat with my P&C collection until Mr X paid me a visit and pointed out my error. The letters are "G.T.", which is General Tool, Portland Oregon.
I will butcher the company history if I try to explain the relationship between General Tool, P&C, and the maker of this socket, Thorsen. But I don't mind speculating that the use of the hexagon in their logo was done deliberately by G.T. because of their previous relationship with P&C, and not because a marketing agency came up with it independently.
General Tool 3/4" drive, 1 13/16" socket, made by Thorsen, ca. 1930s.
Thank you Mr X for the education!
Brian