Picked up this A. B. Co. wrench recently. It's the fourth wrench listed in Rathbone's first book with no indication of reverse side markings. Mine is marked "930 - FOR SLACK ADJUSTMER" on the reverse side. It's 11.5" long and 4" wide at the widest part.
Anybody have any info on the A. B. Co.?
(http://i222.photobucket.com/albums/dd3/buswrench/message-board/ABCo-wrench-1a.jpg)
(http://i222.photobucket.com/albums/dd3/buswrench/message-board/ABCo-wrench-2a.jpg)