Original data provided by Leslie Jones or the Boston Public Library on the negative or negative sleeve: Burleigh Grimes and Dazzy Vance, two of the oldest spit ball pitchers and only these two allowed to throw it, May 30, 1930.
Corrected date based on research by the Society for American Baseball Research, 2016.
Summary provided by the Society for American Baseball Research, 2016.
Note that Dazzy Vance was not one of the "grandfathered" pitchers allowed to throw a legal spitball (Society for American Baseball Research, 2016).