I have always avoided tools that do not have the manufacturer  stamped on and MFD is no exception but today at the estate sale, there is a  set of open end and box end wrenches in very nice condition.  I dont often run across sets so I am interested in buying these.   Alloy Artifacts is no help.    This  is not MFD USA or anything similar.  The only letters stamped on the wrenches are MFD.    no pictures

All I can find that could be close is GM Metal Fabricating Division.