Postcard, Satirical in Colors: God save de king - War of 14 -18, England Great Britain, Singing - Soldiers Illustration by Andre Helle (1875-1945) by Helle, Andre (1871-1945)
Foreign - Non Commonwealth - British commonwealth postal history specialists - Steve Drewett
David Feldman Great Britain, British Empire & Ireland June 7, 2019 by David Feldman - Issuu
catalog Level 3
Finish with a flourish - Grosvenor Philatelic Auctions : Grosvenor Philatelic Auctions
The ultimate postcard grading guide: How to value vintage postcards