thanks both
yeah..saw this
"Zeiss Oberkochen sold their goods branded "Opton" (supposed to be contructed somehow out of "Optische Werke Oberkochen"): for some years as Zeiss-Opton in the West, for three decades as just "Opton" in the East. "
notice "Opton" . there's no mention of Optron i can find . but the lens clearly states
OPTRON 1:2.8 f=28 52diam 6100745.......................:shrug: