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crossed cylinder confirmation test
OPTOMETRIC INSTRUMENTS
crossed cylinder
20th c.
metal; glass
overall: 117 x 41 mm; lens diameter: 35 mm
2003.323
OPTOMETRIC INSTRUMENTS
crossed cylinder
20th c.
metal; glass
overall: 117 x 41 mm; lens diameter: 35 mm
Crossed cylinder. White metal rim and handle with textured grip. Round lens with frosted edges to form a square with red positive and white negative axis markings.
2003.323
Ex Keeler Collection