Hi Cary,
 
Thanks for your helpful & informative reply.   Your citation of Norworth not having attended a ballgame until 34 years after writing those great lyrics reminds me of Edna Ferber not having seen any sidewheelers, & I think, even the Mississippi River before writing Showboat.
 
It'd be nice if Norworth performed the song on a radio broadcast & that a recording might eventually be discovered.
 
Best,
Shiffy