This is a Willie Mays (as a member of the San Francisco Giants) Signed 1993 Upper Deck Baseball Heroes Four-Homer Game Baseball Card, Serial-Numbered #590 of 660! This card has been hand-signed by Willie Mays. This autograph is certified by James Spence Authentication (JSA). It comes with the numbered hologram and matching Certificate of Authenticity. Please see pictures for details on the condition of this card.