Binocular trench periscope
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Binocular trench periscope

细节
Binocular trench periscope
8 x 6°; black-enamelled body, laterally-adjustable lenses, individually adjustable viewing lenses, the base lens section marked in Japanese script and English 2096, NO. 2130 JES [SCREW] [PATENT] 81266 [NIPPON KOGAKU] NIKKO, with matching mini tripod, in maker's fitted canvas case
出版
https://grad.usask.ca/gateway/archive17.html
注意事项
VAT rate of 17.5% is payable on hammer price plus buyer's premium.

拍品专文

Condition: 3(ii)
Cosmetic: Light signs of wear.
Lenses: Clean and clear, minor handling marks.

The Japanese script on the case reads: 92 [1932] Type Square Style Binoculars.

An extensive review of the Japanese optical industry and Nippon Kogaku is given in the reference cited. Nippon Kogaku began making periscopes in 1918. Production continued after the war when Nikon manufactured similar instruments for construction surveying.