Is this ball stamped or is it actally signed. Any help would be great. Does it look authentic. Thanks Much http://cgi.ebay.com/1973-1975-NEW-YORK-METS-AUTOGRAPH-BASEBALL-27-AUTOs_W0QQitemZ330254824144QQihZ014QQcategoryZ2726 0QQssPageNameZWDVWQQrdZ1QQcmdZViewItem>