18K yellow gold miniaturepocket aneroid/altimeter barometer watch chain fob or charm, with open dial exposing works, obverse, and engraved floral motifs, reverse, bevelled glass encasing both sides. Marked "18K" edge of case. 1 1/4" dia. Rare. Circa 1870's. CONDITION: Overall good, working condition with surface scratches to interior dial, few dents to case.
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