Japanese External Reverse Porro Prism Binoculars.
Please note: a great amount of effort has been made to try to be as accurate as possible. But
information about distribution tends to be scarce and fragmentary, and errors or misinterpretation are possible and/or probable.
Please keep in mind that any errors are unintentional, and will be cheerfully corrected upon notification
And that this is a not for profit attempt to document otherwise unavailable aspects of binocular history by optics enthusiasts, for the benefit of optics enthusiasts.
The distinction between Japanese manufacturers, exporters, and distributors and importing country wholesale and retail distribution may be blurred, so I have been generous about inclusion.
MINIATURE BINOCULAR BRANDS ( OWNED):
SOURCES OF INFORMATION:
Riken Kōgaku Kōgyō K.K. (
was formed in 1938, but it’s origins date to to
meaning Physico-Chemical Research Institute, or more correctly
Kokuritsu Kenkyū Kaihatsu Hōjin Rikagaku Kenkyūsho
The research institute was founded initially as a private foundation in 1917, and in addition to pure research from around 1927 it also created the Riken Konzern to spin off commercial firms using scientific achievements of the research institute (in 1937 at its peak it had 63 firms with 121 factories.) After the war the commercial entities ceased to be part of the foundation and in 1958 the research portion became a public corporation funded by the government as a national research institute. So the history is complex.
Riken Kōgaku Kōgyō K.K. exported a good number of 6x15 binoculars to the United States during the occupation period and shortly thereafter and these are marked “RKK” and “Riken” and sometimes also carry the name of US distributors, and after 1953 was known for Ricoh cameras.
The company became
in 1964, but this was presumably after their production of miniature binoculars ceased. The current multi national entity Ricoh Co Ltd may have largely evolved from the sister photographic paper company.
BRANDS W/ MINIATURE BINOCULAR:(believed associated)
SOURCES OF INFORMATION:
U.S. DEPT OF COMMERCE FOREIGN COMMERCE WEEKLY 1958, YOKOHAMA TRADE GUIDE 1954
The 1954 US Dept of Commerce foreign Commerce weekly lists Yokosho Co Ltd. as a “manufacturer and exporter of optical goods, electrical appliances, radios, watch straps, etc and general merchandise.” It is believed but speculative that they are responsible for Yokosho brand binoculars. The Yokohama Trade Guide of 1954 lists Yokosho Co Ltd (probably the same entity) as being located at no 30 Miharudai, Minami ku, Yokohama, and is described as being a general exporter.
MINIATUUR JAPANSE VERREKIJKERS
PIENOISKOOSKA JAPANILAINEN KIIKARIT
ống nhòm mini
مناظير مصغرة اليابانيةچھوٹے جاپانی دوربین
BINÓCULOS JAPONÊS EM MINIATURA
DÛRBÎN JAPANESE XWEBIXWE
دوربین دوچشمی ژاپنی مینیاتوری
MINIATUUR JAPANESE BINOCULAERS
MINIJATURNI JAPANSKI DALEKOZOR
MINIATURNÍ JAPONSKÉ DALEKOHLEDY
MALIIT NA LARAWAN JAPANESE LARGABISTA
MINIATYURA YAPONIYA DURBIN
BINOCOLO GIAPPONESE IN MINIATURA
TEROPONG KECIL JEPUN