This did not scan well at all. And I can't get the center part of the 2 page spread to scan at all. But this will give you some idea of the charcoal metallic sheen of the miniature, plus the few color details that they picked out.
A huge amount of Batman props and costumes have been sold through Profiles in History. Check their web site and back catalogues and see if the Batwing wasn't one of them.