New Vernon Studebaker

Hi everyone: I turned up a Model T or TT or Fordson wrench I never saw and did not see listed in the material I have. It is a 5-Z-1580. It is 20" long, weighs almost 7 lbs, and the fixed socket end is 2" and it is nickel plated. Includes the Ford script, tool number and it was made by Mossberg. A very heavy duty wrench for a large wheel nut? Anyone have any listing for what this one is? See picture. Thanks!!!