I saw this just now on ebay. Bidding is already over $700. Anyone recognize the lens? Is this the fabled "Harrison Globe lens," the early ultra-wide angle?

http://cgi.ebay.com/Civel-War-Era-Scovill-View-Camera-Lens-1862_W0QQitemZ7567423519QQcategoryZ711QQrdZ1QQcmdZViewItem