Nope genuine buyer, but can see why you thought that! I'll be honest I don't know much about lenses but this caught my eye as I know Dallmeyer Lens are collectable. I'm after a IR lens for a "project" but can't find anything technical about the lens. As it's almost certainly a IR lens I'm curious as to the lens material as glass is no good for this field of work, possibility of Germanium which explain the opaque lens.

Thanks for your help so far, I just wish to learn more about this lens, technical specs and year of manufacturer, several lenses like this have appeared on ebay from 500 to 30,000, none detail much information on the lens other then stamped markings.