Diptych Sundial & Compass by Beringer, a pioneer from the late 18th century. Back then, sundials were luxury items made of engraved ivory or metal. Beringer was among the first to use wood and printed paper, making them more affordable. His workshop thrived from around 1777 until his death in 1821, and he became known for portable, wooden diptych instruments. 
The lid is engraved with 48 European cities and their latitudes. The sundial opens in half to reveal two hand-colored dials and a compass on the lower side. A colored cord, called a gnomon, would connect the two halves and cast a shadow in sunlight. The gnomon could be adjusted to match the latitude of the city where it was used.
3 1/2 x 2 1/4  in 
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