Great Scott Antiques
Web site: https://www.greatscottantiques.com/
1:40,000 scale map, (Edition 5) showing progress during the The Battle of Passchendaele/the Third Battle of Ypres
Published by the War Office, General Staff. Geographical Section, Field Service Battalion, Royal Engineers in October 1917.
This large map has been stored folded, it is now torn, holed, and in need of some TLC, but a very rare survival.