Hello, I am looking for some info on this wrench. Stamped SPECIAL on the handle, 567 on one side of the head, ARMSTRONG MADE IN USA with arm/hammer logo on the other side. No size marking, I came up with 1-1/4" across the flats on the open end. Overall length is 10", the open end is 1/2" thick, and the box end is 3/4" thick. Regards, Lou