Oko Six

Oki (Ōki Kōgaku Seiki Seisaku-sho 大木光学精機製作所, i.e. "Ōki precision machinery factory") was the producer of two cameras during the Second World War.

Advertised in 1941–2, the Oko Six (オーコーシックス) was a folding 6×6 with a folding finder, and a Purejon (プレジョン) shutter. There were two versions, the Oko Six I with a Sanko (サンコー) 75/4.5 lens; and the Oko Six II with an Okor (オーコール) 75/4.5 lens.

Advertised in 1942, the Oko Semi was a folding 6×4.5 camera with a Purejon shutter and an Okor 75/4.5 lens.

Names in roman letters above are tentatively inferred from katakana printed in advertisements; the actual roman forms may differ.