So is Barling's arched over Make pre and trans and post trans? Just inquiring about 4 digit pipes that begin with "5". They have Barling Design "design in script" on the opposite side of the cross on the stem.
1962. Short version of the story, "The so-called “Transition” era pipes can’t really be clearly defined. The only exception are the pipes made for a short period in 1962, a “Barling’s Make” pipe whose four digit model number begins with a 2, 3, 4, 5, or 6."
Read more here.
https://pipedia.org/wiki/Barling