There are many companies that had 70-210mm F4-5.6 lenses in their lineup. Tokina, Tamron, Sigma, Cosina und so weiter and to confuse it all further they often outsourced production to other manufacturers. There is a bit of that stuff still going on though, but no to the same extent, but your lens is still worthless even if ultra rare and a bit of fascinating history. Optically it is not a marvel, usable yes, but soft and cheap and also in need of a cleaning which will cost more than it is worth if you are unable to do it yourself. These things are thrown in as freebies when you buy old camera gear.
