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Europe: United Kingdom
3rd quarter 19th c.
eye: 42 mm; dbl: 28 mm; pd: 70 mm
Protective spectacles. Steel front with folding perforated eyecups. Slots for attaching head strap. Solid metal bridge covering interocular and nasal bridge areas. Short straight sides with rectangular ends. Round eyes, glazed with clear plastic lenses. Right lens contains two rough (ventilation?) holes.
American Optical Collection