Is this a R. Herschel of Peoria,Il wrench. Rathbone shows some Herschel (S) wrenchs but this looks a little newer. It is 8 inchs long and about 1/2 thick on ends and 3/8 thick in middle. Probably malleable casting. Depressed (Herschel) on one side and depressed (8) on back. Back also has (5/8) and (7/8) depressed and openings actually measure 5/8 and 7/8. Any info appreciated.