de Havilland Hercules Air Liner, A

Small interlocking plywood jigsaw puzzle produced by J Salmon in association with the Meccano Magazine.
The painting, which is unsigned, features a de Havilland Hercules triple-engine biplane, in flight above the pyramids of Giza, with a further single-engine plane taking off behind it. This particular Hercules, number G-EBMY, was one of several built for Imperial Airways in the 1920s to operate services between Cairo and Baghdad, as well as Cairo-Karachi. A little research found a photographic image of this specifically numbered aircraft, carrying the name of City of Baghdad. It also transpires that the very name of Hercules was chosen as a result of a c1926 competition in Meccano Magazine, whilst the prototype aircraft was still under construction! Source Wikipedia.
The puzzle itself included an additional piece, presumably from another copy of the puzzle, which was most likely added to this box by mistake during puzzle production.
Many thanks to BS for helping to identify the puzzle's number, title and approximate year of manufacture.

Artist: Unsigned
Date: c1930/31
Brand: Salmon Ltd., J.
Material: Plywood
Nationality: British-England
Number: J.727
Pieces: 100
Range: Academy
Series: Meccano
Size: 8 1/4" x 6 3/4"
Theme: Aviation
Title: de Havilland Hercules Air Liner, A