We are surprised to not find a mark on this one, as it is in the patented design from Trammell Bits, with a very distinctive look, and is nice quality. We are selling it unmarked, but it likely is a Trammell. 5.5″ mouth, with inlaid copper rollers on a dog bone joint, shorter swept back shanks at 6.75″. Has very limited gag action. In good used condition.