The product is a 1961 Fleer Baseball Greats trading card featuring Johnny Mostil of the Chicago White Sox. This card is signed by Mostil and authenticated by PSA as a 7 MC, meaning it has been signed and graded as a 7 out of 10. It is a part of the Base Set for the 1961 Fleer Baseball Greats series and is considered a Rookie card. This rare and collectible piece would be a valuable addition to any baseball card collection, especially for fans of the Chicago White Sox or Johnny Mostil.