A BRASS UNIVERSAL RING DIAL, signed J. Jackson Fecit , English, early 18th century, engraved with the degree scale for North and South latitude and with altitude scale on the reverse, pivoted 24-hour roman chapter ring, the support for the pinhole sight engraved with calendar, degree and Zodiac scales-- 3in. (7.6cm.) diam.
A BRASS UNIVERSAL RING DIAL, signed J. Jackson Fecit , English, early 18th century, engraved with the degree scale for North and South latitude and with altitude scale on the reverse, pivoted 24-hour roman chapter ring, the support for the pinhole sight engraved with calendar, degree and Zodiac scales-- 3in. (7.6cm.) diam.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
