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Surveying, Geometry & Technology - Four pairs of opera glasses. Germany, circa 1880–1960: 1. Large opera glasses made of brass with mother-of-pearl inlays. 2. Opera glasses by R. Treuer, Factory for Eyeglasses and Theater Glasses, Mohrenstrasse 41, Berlin W., brass with black lacquer finish, leather case. 3. Small pair of opera glasses, brass with black lacquer finish, leather. 4. Small pair of “Seeadler” opera glasses, 85, Nuremberg 20 International, brass and plastic. All in working order. Heights: from approx. 6 cm to 13 cm. A lot of four binocular opera glasses. Germany, ca. 1880–1960, brass, metal, leather, and mother-of-pearl; all in good working order. Heights range from approx. 6 to 13 cm.
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