A Johann Somer silver and gilt brass universal equinoctial ring dial,, German, mid 17th century
A Johann Somer silver and gilt brass universal equinoctial ring dial, German, mid 17th century,
signed Johann Somer, on standard construction with silver bridge and sun sight moving over calendar and zodiac scales, engraved with 25 cites and latitudes overall, in original leather pocket case, the instrument 2 7/8in (7.3cm) diameter
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A Johann Somer silver and gilt brass universal equinoctial ring dial, German, mid 17th century,
signed Johann Somer, on standard construction with silver bridge and sun sight moving over calendar and zodiac scales, engraved with 25 cites and latitudes overall, in original leather pocket case, the instrument 2 7/8in (7.3cm) diameter
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