Bidspirit auction | RARE WWI GERMAN AND BRITISH

RARE WWI GERMAN AND BRITISH AIRSHIP POSTER - Scarce WWI British aircraft recognition poster with large title at top, 'Public Warning'. Airplanes and airships are shown in silhouette for citizens to determine if the aircraft is British or German. His Majesty's Stationary Office, printed by Sir Joseph Causton & Sons, Limited, 1915, 34.5 x 22.5 inches. Minor loss at top edge.