Ok, both the Kassner imports have an asking price of approximately $1,000. From what I can tell, both guns where likely manufactured by Zabala and imported by Kassnar in the early eighties.
I have been unable to determine how much these guns sold for new although I have been told they went for somewhere in the neighborhood of $600 (I have no idea how reliable this is). Both guns appear to be in similar condition.
I'm also very curious about a new Zabala. Their website shows that they are still manufacturing a 10gauge SxS (213 Magnum). Does anyone have any information regarding a current importer for Zabala?
http://www.collectorsfirearms.com/admin/product_details.php?itemID=9404