Believed to be Canadian Era (1970-1980) however shank not stamped 'Canada'...with the aluminum Rock Maple Distillator . Bore ID tooling taper from .750" to .700" , OD 1.610" , Length 6" , Height 1 7/8" , Bore depth 11/8" , Weight 1.5695 oz. (44.5g). Mortise drawhole slightly smaller than 5/32" ...Distillator Tenon drawhole 7/32" which takes the Rock Maple filter insert with an ID of 7/64". Tight fitting one dot brass pin Fishtail stem. See Pipedia - Brigham Pipes for any questions.