eBAY Requires full information unto how this autograph was obtained for authenticity, so upon shipping your autograph, a LOA (Letter of Authenticity info.) will be included in your winning(s) 

YOU ARE BIDDING ON A SIGNED 3x5 INDEX CARD OF JOHN ASTIN .. OBTAINED YEARS AGO AT COMIC CON IN SAN DIEGO / SIGNED USING A MARKER - Inscribed: All the Best - WELL PROTECTED  

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