I found this when I googled on deck circles - this is a post from 2011.
"I have seen many pictures of the old baseball parks in which the on-deck circles had both the home team's one and the visitors' one. I think Wrigley Field still does it, probably Dodger Stadium and Rogers Centre. However, most parks have the home team logo by their dugout and either the league's on deck circle (Ex. National League or American League Logo), the Major League Baseball logo, or, in the case of US Cellular Field, The White Sox logo by the Sox's dugout and a US Cellular Field one with a white sock by the visitors' dugout."
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