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386551001
Diptych-dial; ivory; filled in with colour; wegweiser with arrow index; vertical pin-gnomon dial showing Babylonian and Italian hours; holes inset for upper end of string gnomon; list of twenty-two European towns with their latitudes; horizontal dial for string gnomon; compass with mark for declination N15W; inscription; pin-gnomon scaphe-dial; signature; trade-mark of crown and wind symbols in compass well; volvelle for interconverting solar and lunar times: central rotating disc missing.
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