That's a neat looking wrench, would like to own one.
I did sell a two socket variant on Virgil Saak auction in 2010 (Lot 692). Didn't find a patent or any other information. I wonder now if the other two sockets were broken and then ground smooth.
(http://i222.photobucket.com/albums/dd3/buswrench/saak-2011/VS-688-694.jpg)
0692. Lot of two: Cast Malleable Oddball Wrenches.
(1.) WALLACE UNIVERSAL WRENCH / PAT APL'D FOR - - 10.5" different double hex socket wrench. Pitting. (unlisted, no info, patent not found)
(2.) Unmarked - - 7" bed key wrench with seven sizes and a screwdriver. Poor, pitted, grind marks, (S881).