Folding opera glasses, French patent, in velvet case

Made:
1850-1950 in Europe

Folding opera glasses, French patent, in purple velvet case, unsigned, Europe, 1850-1950

Details

Category:
Optics
Object Number:
1990-286
Materials:
glass, leather, wood (unidentified), brass (copper, zinc alloy) and velvet
Measurements:
overall: .2456kg
case: 122 mm 50 mm,
opera glasses: 11 mm 35 mm,
type:
opera glasses, binoculars and instrument case
credit:
Christie's South Kensington Limited