I would say that you are likely correct, as to the series. However, it may not be possible to absolutely ID the batter to be Mann.
Ballpark stands appear to be Sportsman Park, in STL.
Here is an accessible archive of slides for comparison.
https://www.digitalcommonwealth.org/...ai%3Ab8518025s
https://www.digitalcommonwealth.org/...-oai:b8517z38g
Good luck!