A silver universal equinoctial ring dial, German, circa 1700

A silver universal equinoctial ring dial, German, circa 1700,
with double 1-XII hour scale, bridge gnomon with calendar and zodiac scales, suspension loop sliding over 0-90 degree latitude scale, three ring faces with various European towns and latitudes, in circular fish skin case with silver stud decoration and red velvet lining,
the dial 3in x 2 4/5in x 3/10in (7 4/5cm x 7 1/5cm x 3/4cm), case 3in x 3in x 1/2in (8cm x 8cm x 1cm)
Provenance
Trevor Philip & Sons Ltd., Brighton, 1985
Private collection.