This colorful wheel from 1931 features 40 Wonders of the World on the reverse.
This rather Art Deco wheel dates to 1932, when Myanmar, Thailand and Iran
were still Burma, Siam and Persia.
This 1933 nail gauge had a "loop" at the top so that it could be hung
in the nail section of a hardware store.
World War II saw a lot of these spotters, for airplanes, ships, insignia, etc.
A Winterhouse Edition
Princeton Architectural Press