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I can't be positive but I'm pretty sure that is not Jack Buck doing the announcing.
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It could be a young version of him, before he completely fell in love with his own voice.
http://www.stlradio.com/hof-legacy-1.htm
Jack Buck
For several generations of baseball fans, Jack Buck’s voice has been permanently linked to the St. Louis Cardinals. He came to St. Louis to be a play-by-play announcer for the team in 1954.
With the exception of a couple years, Buck has continued in the booth for the Redbirds, but he held many more jobs. At KMOX, listeners heard him doing play-by-play for St. Louis Cardinals football, University of Missouri basketball and football, and, for a short time, St. Louis Blues hockey.
He also did Monday Night Football for CBS Radio and broadcast numerous Superbowls and World Series games. For several years in succession, he logged over 200,000 air miles annually. He is a member of the broadcast wing of the Baseball Hall of Fame and was given the Pete Rozell Award by the National Football League.
Jack Buck also established himself as a strong team member at KMOX. He was a disc jockey in the late 50s, and was the host of the first “At Your Service” program February 29, 1960. He hosted Christmas morning programs from his home every year, and, in the ultimate indication of community involvement, was known to host up to 250 civic and charitable events a year.