I think that the Vixen camera was modeled on a Pentax 35mm film camera, maybe the K/KM/KX or K1000 model(s).
What controls, dials, etc are on the top plate and what are their markings? On these manual cameras, you can set the film ISO rating, shutter speed and I think the metering is a match needle system in the viewfinder.
Cheers
Dennis
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