I've looked thru many of the auctions and haven't found this on them.
Who made this?
(http://i1082.photobucket.com/albums/j368/wvabe/002_1.jpg)
(http://i1082.photobucket.com/albums/j368/wvabe/001_2.jpg)
No idea. Fantastic old wrench though.
E.W Ross style wrench, may be one that just hasn't surfaced in a parts catalog yet. I like those silo filler type wrenches, but apparently nobody else does because they never seem to bring much money at auctions.
The closest one that I've seen didn't have the socket end but a closed end.