As I discussed in greater detail in post #3
, the large, odd font with no "No." or branding on the OP's "412" socket was already enough to eliminate Snap-on for me -
except for that tiny "1/2" marking. THAT marking, used by Snap-on to distinguish the high end of its 1/2-drive line from the low end of its 5/8-drive line (the 15/16" (30/32"), 31/32", and 1" (32/32") sockets would've all been No. 300, 310, and 320) was pretty much thought to be a uniquely Snap-on thing, as far as I knew, and added, it has to be said, in hindsight, only to fix that little numbering scheme overlap.
@Steven 33 's "H_y NO. 4
1/2" drive tool changes everything - and this thread just got more interesting to me than a solo mystery socket ID.
Is that convention routine for early Husky? Did all their 1/2-drive tools and sockets have the tiny "1/2" markings? Ostensibly, I am guessing - and similar to Snap-on's reason, to distinguish it from drive tools of a closely adjacent size? What would that have been? I know they made 9/16-drive, but that was hex, not square.
I just scanned the Husky thread, populated mainly with tools from
@Oldtuleguy and
@Steven 33, and don't think I see any others.