I've seen those lenses on ebay previously... within the past few months.
A google search for the auction text turns up this auction from Oct '12
You might contact that seller and see if this new seller was indeed his buyer in October.
Also, that's an original model Iscorama with an M42-mount taking lens - not an Iscorama 42. The rear element on that lens will be about 10mm smaller in diameter than an Iscorama 42.