There's a "black top" finish Edwards on Ebay. Back is transparent/natural rather than black. Is this a refinished top maybe?
http://cgi.ebay.com/RARE-Edwards-ESP-LP-STD-BLACK-TOP-DUNCAN-PU-S-USED_W0QQitemZ120190295194QQihZ002QQcategoryZ33038QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://cgi.ebay.com/RARE-Edwards-ESP-LP-STD-BLACK-TOP-DUNCAN-PU-S-USED_W0QQitemZ120190295194QQihZ002QQcategoryZ33038QQssPageNameZWDVWQQrdZ1QQcmdZViewItem