On the Tagus

Estimated to be of c1930's vintage, this 400 piece fully interlocking plywood jigsaw puzzle features a colourful painting of shipping on the River Tagus, the Iberian Peninsula's longest river.
I have not identified the artist, so please let me know if you can supply a name. Thank you.


Artist: Unidentified
Date: c1930's
Brand: Cavalcade (Mack, W.E.)
Material: Plywood
Nationality: British-England
Number: 1265
Pieces: 400
Series: Cavalcade
Size: 19 3/4" x 14 3/4"
Theme: Maritime
Title: On the Tagus