Red and Blue

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Many people collect old lenses as a hobby, or simply have older lenses they're interested in using on modern cameras.

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What type of lens mount is this Som Berthiot?

I bought this som berthiot 20mm f1.9 lens assuming it was a c-mount but it is much smaller with an elongated screw mount. Can't figure out what type of mount this could be. Here it is compared to ...