Could be a pitching machine batting cage?
Not sure what the common name for one is but I would have thought that they were more recent than 1972.
Starting9 GM - Team Phungo
What the heck is that behind Bob Veale? At first glance I thought it was a batting cage but I don't know what it is
The Shlabotnik Report
1972 Topps #729 Bob Veale Pittsburgh Pirates
card 2316/38019
every topps card
