Originally Posted by
studiochrom
its either a Gruppen Antiplanet or a Rapid Antiplanet. hard to say without seeing how the elements are arranged. also the flange would have been helpfull, since it was mostly engraved.
i would guess its a Gruppen Antiplanet Series II No.6, having a starting aperture of F6.2, probably meant for the american market. it should be quite a nice lens with good image quality and a nice depth of view. should be really be heavy in weight, since they used serious amount of glass for the elements.
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