Excellent answer, FrontMan. The point is yours.
I will label the puzzle as "1926 or 1927". No doubt A Coachbuilder was involved in making this Coupe, but little evidence exists for or against it being Surbico. Mr. Sedgwick's May, 1976 message in MotorSport is quite informative about Beverley-Barnes.
Single-source puzzles can be hard to verify. As you know, my puzzle is based on the image below.