A surprise today, another maker for this patent, and a better match to the drawing..
Marked "METAL DEVICES CORP/CHICAGO ILL"
and " PATENTED MARCH 10 1914"
The head looks just like the Chicago Spec one, but the handle is different.
This thing is HUGE, it is 14" long and takes perhaps an inch drive socket (1+1/16, but it has the slot for a flat spring like the CS one) ... sadly , no sockets found with it....
May have an empty square as a forge mark, not certain, very faint, could be casting rubbish..
(Iron trade review, 1927 mentions Metal Devices Corp, Chicago assets being sold at auction Oct 4, 1927)
Apparently, the ratchet was not a HUGE success....)