Walden & Mossberg started making those wrenches around the time of the Ford Model-T and continued into
the 1930's.
I have a want list of 6 Walden wrenches and 8 Mossberg wrenches.
some are brace type crank socket wrenches, some are tee type, some are straight handle with a 90 degree
socket, and some are double ended sockets at 90 degree.
Walden; 1812, 3240, 3648, 01516, 2228 & BS18
Mossberg; 613, 622, 627, 636, 638, 676A, 676B & 652 which is a universal tool, it is flat steel with a slight bend
and has an opening about 15/16" it is used to hold the universal for assembly.