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OPERA GLASSES AND SPYGLASSES
objective lens: 35 mm; overall: 88 mm x 42 mm; visible eyepiece lens: 11 mm
Five-draw spyglass. Straight-sided barrel consisting of ten Mother-of-Pearl panels. Two decorative bands of red stones. Brass draw tubes. Bi-convex eyepiece lens and non-achromatic bi-convex objective lens.
BOA Purchase, 1935