ew experience.  Just found a hex drive socket set where the drive is approx. 7/16.  No size mark on socket or ratchet.  One socket measures 3/4.  Am I looking at a British or other make?

IIRC, AA lists a company who marketed 7/16" drive tools that could replace both 3/8" and 1/2" drive. The steel they used was supposedly strong enough to handle 1/2" drive jobs. One set to replace two competitors sets.

      Duro-Indestro made stamped steel ratchets in 7/16" hex drive.    Many were not marked with a stamping as they were sold under a billion private brands for decades.    A picture of the ratchet and a socket would cofirm or deny this fast.     One clue is socket markings like 5-8 in place of 5/8".

George, it  was Blackhawk that touted the 7/16" square drive as the new miracle size of drive.     

In the Nov issue of The Family Handyman P99  a new hex drive socket ratcher. Ratcheris female hex and sockets are male hex drive wwith the sockets stored in ratchet handle.

Kobalt Xtreme item # 56B267  at Lowes.