A rare gilt brass combined altitude disc sundial and perpetual calendar, German, mid-17th century,
constructed from five plates two of which are rotated by small projections on the periphery, sundial with hinged gnomon moving over calendar scale and with 4-12-1-8 hour scale, apertures showing days of the week and classical deities, the reverse with perpetual calendar and lunar volvelle, outer ring with 1-31 scale, apertures for zodiac signs, day and night length and months, mounted with long suspension fork and swivelling ring,
3 1/2in x 2in x 1/2in (9cm x 5cm x 1 1/2cm)
Footnotes:
Provenance:
Private European collection.
Trevor Philip & Sons Ltd., London, February 2003.
Private collection.

No case, on perpetual calendar dial, pointer to outer date scale broken and missing major part of the pointer, otherwise in good overall condition.