Watch List notes:

World War I - Posters, Great Britain. 1915 Airship and Airplane Recognition. 22 1/3 x 34 ½". His Majesty's Stationery Office. Sir Joseph Causton & Sons, Ltd. "Public Warning", airships and Aeroplanes in black silhouette to help citizens differentiate between German and British types; black and red lettering. A classic and rare poster. Light rippling and nicks in outer red border, small internal margin tear, pencil notation on back. Very Fine..

Estimate: $300-400