A Wooden Diptych Sundial with Compass; image credit on full record.
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Sundial Compass; German, Diptych, Pocket, Wood, Paper Dials, 4 inch.
Wooden Diptych Sundial, probably Germany, 18th/19th century, with printed listing of cities and latitudes on the top, opening to an interior of printe... [more detail available via subscription]