Posted By:
Fred CI'm sure most of you already know about N300 (Mayos) cards. They have a BLACK back. If you see a Mayo with a white (card board hued) back it is either skinned or not real.
http://cgi.ebay.com/1895-MAYO-CUT-PLUG-P-LOVETT_W0QQitemZ130174263752QQihZ003QQcategoryZ868 39QQssPageNameZWDVWQQrdZ1QQcmdZViewItem