As I said I have no data on sales of these so I can't really say much. For Roberto Spizzichino's later work his cymbals now sell in the same price range as New or Intermediate old Ks (I gave a link to this in my earlier post). But these? Machine hammered ones? I don't know.
There is the historical interest collectable factor.
Then there is the intrinsic value as a B20 cymbal. If we look to machine hammered Avedis Zildjian 22" cymbals as a guide to pricing we're talking $150-$250 in the USA.
Avedis prices ref: http://black.net.nz/avedis/avedis-prices.html#22
Then there is how nice it sounds. That could easily double the price.
Sorry I can't be of more help.