Scarce 1960s Sandy Koufax & Don Drysdale Dual Signed Baseball JSA #Z23477

Scarce 1960s Sandy Koufax & Don Drysdale Dual Signed Baseball.  This is one of very few known examples signed during their playing days.  The period ink signatures are together on the same panel and rate an 8/10 in strength.  The ball is in excellent condition with mild soiling and surface wear throughout, consistent with a game used ball.  The manufacturer’s stampings have long faded but is likely an Official National League ball.  Overall this is the finest example of a vintage Koufax/Drysdale ball we have ever seen, with display qualities that will probably never be seen again!  Includes a Full Letter of Authenticity from JSA (#Z23477).