Papaw, most ACme wrenches that I have seen has the adjuster nut on the lower rod,
there were about 3 or 4 companies making the Acme wrench.
Whitman & Barnes Mfg. Co. New York, N.Y. put the adjuster nut on the top bar, but I
have not seen any pictures like yours. which seems to be a nut & pipe wrench.
will keep my eye out for any pictures, Frank