This wrench has the MTF Logo stamped into the head. On the reverse, the sizes are stamped on the head, 5/16 S.A.E. and 1/4 S.A.E. respectively. The non-use of the U.S.S. standard dates this wrench to 1927 or after. Note the logo is Milwaukee only, as opposed to the Millwaukee Tool and Forge Co. logo. This could possibly indicate that the logo changed to simply Milwaukee in 1927 or 1928.