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38mm flat bifocal lens & envelope
OPHTHALMIC LENSES
lens
Mid 20th c.
glass
overall: 38 x 42 mm; segment: 38 mm
2004.408
OPHTHALMIC LENSES
lens
Mid 20th c.
glass
overall: 38 x 42 mm; segment: 38 mm
Flat bifocal lens (prism controlled) in a plain white lens envelope with handwritten identification. 38mm segment.
2004.408
Gift of A.S. Whitmore, 2003