Here we go. From WCOL in Columbus, Ohio, circa 1963:

1230’s doubleheader
(15-second instrumental bed)

And a pair of jingles from 1970, from a no-longer-in-existence Washington, D.C., station:

Double play, WEAM

Triple play, WEAM

True, they’re not directly related to baseball, but they are more grist for my upcoming thesis “An All-American Pick Hit: Baseball Imagery in PAMS Radio Jingles, 1958-1975.”