BIG LEAGUE BASEBALLS.com | MUSEUM OF BASEBALLS | MISCELLANEOUS, MISPRINTS & PROTOTYPES | Spalding American League Organge MacPhail Baseball
About the Ball: Very bright orange. Official American League Spalding stamps; MacPhail league president stamp. But on a "hotter than hell" orange ball.
Charlie O' Finley tried to have the Majors switch to these orange baseballs in the early 70s, but to see a protoype with official MLB stamping is a bit shocking, consider how quickly Finley's idea was dismissed. You can read about it all at BigLeagueBaseballs.com.