Williams wrench

[john k]

Someone called these set-screw wrenches?   Which fits with the severely square jaw opening.  Notice the difference in the logo between the bottom two.  Top one is a Bonney, and threw the chisel in for size comparison.

[Lostmind]

I've heard them called tool post wrenches also.

[mvwcnews]

I've heard them called tool post wrenches also.

In 1938 Vonngegut Hardware (Indianapolis )  catalog the WILLIAMS  set screw wrenches have open ends on both  ends (two different sizes) set at 22 1/2 degrees to the handle   while the tool post wrenches have an open end & square box end  (both the same size).

[Lostmind]

Thanks for educating me . I now know the difference.