A variation of that ad in Automotive Industries magazine hints at the contents.
"The tools are all held in place by leather loops. In the outfit will be found soldering materials, solid double-ended spanners for nuts from 1-8 to 5-8 inch, alligator and monkey wrenches, cutting pliers, pipe pliers, heavy and light screwdrivers and files, hammer, chisels and punches, chain holders, scrapers, hydrometer, emery, emery cloth, cotter pins, and so on."
"The complete kit weighs eighteen pounds."
(Ouch!)