From the title block of the drawing: "Easthope Bros. Ltd., Marine Engines, Vancouver, B.C.  Mag[neto], Bracket, Handle and Float Member.  Drawing Number 2029.  Drawn 23 Oct 1939."  Never published before 2019-07-21.
Easthope Bros. Ltd., H. Donaldson
CC BY-SA 4.0
Easthope Brothers, Limited.