Brain Storm Jig-Saw Puzzles (Set of 4)

A set of four 32 piece plywood jigsaw puzzles, each individually boxed and labelled, all contained in a sturdy box, promoting The Progressive Puzzle Game, presumably intending that the puzzles be made up as a contest between participants. No guide pictures supplied.
Estimated date of c1915-1920.

Brand: Gamage's
Material: Plywood
Nationality: British-England
Pieces: 4 x 32 piece
Range: Brain Storm
Title: Progressive Puzzle Game, The