MY84
VMYG reply by Russell Potts
The boat appears to be a reduced version of Bill Daniels' Prospero of 1913. The original was 60 inches overall and rigged as a schooner. See link. The design was very popular, both in its original form and in a range of reduced sizes, many of which were rigged as sloops. See XPDNC drawing below. The design stayed in print in the little Percival Marshall 'Model Sailing Yachts' from 1913 till well after the war, so it's hard to be certain when your example was built. The use of a Bermuda rig suggests relatively late, say after 1930. The use of ply for the deck, if it is waterproof ply, puts the build date after 1945. The Braine gear was the norm from 1904 until about the mid 50s when seriously competitive model skippers switched to vane gear. But a 40 inch boat doesn't fit any of the recognised model classes, so she probably wasn't intended to race. So she could be as a late as 1960.