Britain's Mightiest

Super puzzle taken from a Great Western Railway's poster of GWR King Class No. 6000 George V, by Moy Thomas. Produced from 1927-1930.
Two different box examples are shown, brown being the earlier and black (later)
Puzzle image and later version black-box are shown courtesy of John Ravenscroft's collection.

Artist: Thomas, Moy
Date: c1927-1930
Brand: Chad Valley
Material: Plywood
Nationality: British-England
Pieces: 150
Series: GWR-Great Western Railway
Size: 14" x 14"
Theme: Promotional, Railways,
Title: Britain's Mightiest