Unbranded 28mm lens

[Perceval]

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I have a screw thread 28mm f3.5 lens that looks exactly like Kobalux/Pasoptik/Avenon/Bower branded lenses of the same specification but it has no maker's name (and no serial number).  It feels substantial and  performs excellently, with extremely good resolution.  Single-coated, it has a little lest contract that moderns lenses. My guess is  that  it is part of a  pre-production test run ?

[Perceval]

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[frame-it]

Maybe a test model for the V2 version.

"Originally made in 1981 in chrome with distinctive round focusing tab, a six-blade diaphragm and minimal focus to 1 meter. The second generation, or "M-series", was sold in black with a silver rim. It has a crescent-shaped focusing tab, an eight-blade diaphragm, grip tabs on the aperture ring and minimal focus to 0.75 meter."

[PMCK]

Thanks, frame-it.  Six-blade diaphragm, 1 metre closest focus, matt silver/chrome finish but depth-of-field scale is on polished chrome.  Unusual to have a capital F in the max aperture description.