AN IVORY SUNDIAL
Possibly Italian 17th century
the ivory plate with inscription to side P.S.T.H.S. AVBRI, two cherubic heads with pin-hole sights, a calendrical scale with four pin-holes, a regiomontanus-type projection and a graduated quadrant arc, the corners with engraved decoration, the reverse carries a shadow square.
3¼in. (8.5cm.)
AN IVORY SUNDIAL
Possibly Italian 17th century
the ivory plate with inscription to side P.S.T.H.S. AVBRI, two cherubic heads with pin-hole sights, a calendrical scale with four pin-holes, a regiomontanus-type projection and a graduated quadrant arc, the corners with engraved decoration, the reverse carries a shadow square.
3¼in. (8.5cm.)
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