Folding bow spectacles

Folding bow spectacles

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England, 1760. Extremely rare folding bow spectacles with shark skin case. Thank to the silver bridge and the double hinges, the two lenses inserted in horn rings, could be put one on top of the other one, looking like a wheel. On the bridge there is a signature "BM". It belongs to Benjamin Martin, Optician in London, inventor of the lenses in the horn rings.
Category: Spectacles with folding bow
Periodo: 1750-1799
Anno: 1760
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