Originally Posted by View Range
If that many lenses were made, they could be frequently be seen.
Not necessarily if they went into TV. Back then, that still was a state operated affair in most of the world, where economic rules like selling off the surplus often did not apply - on the contrary, tax exemption rules sometimes make it impossible or at least unprofitable to transfer anything out of that public domain. At one of my former employers in the German TV system, a technician was fired for "theft" and fined for a tax fraud after he was caught dustbin diving after some Nagra tape decks they had disposed of as waste.