A miniature ivory Diptych sundial compass with engraved Roman numerals and string gnomon; image credit on full record.
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Sundial; Diptych, Pocket, Ivory, French.
A French Ivory Diptych Dial, with engraved Roman numerals, string gnomon, printed compass rose and blued-steel needle, the top face engraved with S mo... [more detail available via subscription]