A small gilt brass universal equinoctial ring dial, Continental, circa...

A small gilt brass universal equinoctial ring dial, Continental, circa 1700,
with double 1-12, 1-12 hour scales, outer ring with engraved latitude scale 0-90 degrees, gnomon bridge with month scale, in double hinged fish skin case with red velvet lining and silver studded outer edge decoration,
the dial 2 4/5in x 2in x 1/10in (7cm x 5 1/5cm x 1/4cm), case 2 1/2in x 2 1/2in x 1/2in (6 1/5cm x 6 1/5cm x 1 2/5cm)
Provenance:
Stuart Talbot, London, 2002.
Private collection.

Footnote
The double case was made to house two instruments, the missing instrument could well have been a perpetual calendar.