Folding bow spectacles


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.

Year 1760