Where can you find the value of or sell a 1933 Chicago Cubs autographed baseball with 19 signatures?

The value depends a great deal on the condition of the signatures, who signed the ball, the condition of the ball, whether or not the ball is an official national league ball or some other type, and several other factors. According to the collector's price guide "Team Baseballs," your ball is worth $500, but this value can be greater or lower depending on players present - in particular the inclusion of Hall of Famers Kiki Cuyler, Gabby Hartnett and Billy Herman - plus the all-important overall condition of the ball and Autographs. Other key factors include type of ball (is it an "Official National League" ball?), whether there are any "clubhouse signatures" (autographs signed by ballboys, attendants, etc), and number of signatures present. Player autograph were often signed by clubhouse attendants, so authenticity of the significant signatures is still the main factor in determining overall value.