135 square frame.

Many 35mm stereo (3-D) cameras such as the Realist shoot square frames (though they would typically have been mounted into stereo slides). http://en.wikipedia.org/wiki/Stereo_Realist

I am a proud owner of a Tenax II which uses one lever to wind and one to focus. Small and well made but would trade for a IIIc

Any idea of the vintage of the negatives?

I once owned a Yashica EZ-matic that also took 126 film and produced square slides. I bought it in the mid 60's, probably around 1966.

A fun camera to own, a Zeiss Ikon Tenax I 35mm, 24X24 format / 50 exposures / roll of 36, pictures here if interested.

Quote:

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Originally Posted by desertratt

Any idea of the vintage of the negatives?

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I suapect mid 1950's. The negatives are normally perforated and are 24mm square. The black and white set are on Agfa film. So we can rule out 126 and my sister remembers my father having an Agfa camera of some sort. So the smart money seems to be on an Agfa rapid.

Postscript.
My mother has identified the camera from a photograph downloaded from Google. It was indeed an Agfa Rapid. Mystery solved.

Thanks for your help.

Agfa Rapid cameras were introduced as a immediate consequence to the introduction of the Kodak Instamatic system in 1963. So those photographs cannot be made in the mid-50's.
And I don't know any earlier Agfa camera that exposed 24x24mm images on 35mm film.

Early Nikons and Minoltas are 24x34 (32?)
Not square, but less rectangular