Below is the first official postage stamp ever produced with a baseball theme. It was issued in the Philippines (then a US territory) in 1934--Babe Ruth’s last year with the Yankees. This example was "canceled" by Ruth.
Ironically, the first US domestic postage stamp with a baseball theme was not issued until 1939, keyed to the celebration of the "centennial" of baseball.
(displayed at about three times actual size)
Lyman
