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circa 1950
This particular instruments is mounted on a fine wooden display stand
Circa 1770-1880
This precision instrument contains most of it’s original lacquer
Lamp has been electrified- originally oil burning
Opticians Universal Adjustable Trial Frame with Removable Magnifier navigation circa 1950Patented June 25, 1896. Primarily used by watchmakers, jewelers, opticians, and the like. Distance between lenses have knob adjustments, and angles can be rotated along the gear mechanism. Lenses are adjustable and interchangeable (pictured with bue & red lenses). Square lenses are a magnifier that can be removed by unhooking from frame. American or British made.
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