Zig-Zags (Grant Richards Limited)

A very interesting leaflet promoting Zig-Zags as The best jig-saw puzzles, attributed to:
Grant Richards Limited, 32, Orange Street, London W.C.2.
Grant Richards was a London book publisher and is now known to be the link between the early Zig-Zag Puzzle Company, known to have occupied these same premises in 1915 and the later Richards Art Co, who produced the RACO-Intalok-Zig-Zag puzzles.
Many thanks to TT for supplying details of this discovery.