18th Jan, 2023 11:30
Scientific Instruments, Optical Toys & Photographica including an Important London Collection
A Large Keystone M1A1 Binocular Stereoscopic Tester.
A Large Keystone M1A1 Binocular Stereoscopic Tester. #1283 circa mid-1930s. A heavy-duty, table-top instrument, originally designed for ophthalmic use when testing the depth vision of US Airforce pilots. Can be used to good effect as a normal stereo viewer.
(Internal Ref T10)
Sold for £212
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