A 1912 Spalding advertisement featuring Connie Mack, Hughie Jennings, and Harry Davis that appeared in West Coast newspapers after the rubber-centered Goldsmith baseball replaced the cork-centered Spalding as the official ball of the Pacific Coast League:
“They all use the Spalding Cork Center Ball, the only Official Ball, the only Ball recognized by the Official Baseball Rules, and the only ball that can be played with in the world series games for the next 20 years. Do you realize this? Every professional baseball player, every professional baseball manager, every professional club owner should insist upon the Cork Center Ball, the Standard Baseball, the Official Ball of the World Series.
Of what value are players’ percentages to compare with the records of the National and American leagues unless they play with The Spalding Cork Center ‘Official National League’ Baseball $1.25 Each.”
Another 1912 advertisement for the Spalding “Cork-Center Ball”
Baseball History Daily 
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