Photo scanned and downsized, from the book <i>Ballparks of North America</i>, by Michael Benson, 1989, p.255. The original would be from the 1880s.
<ul><li><a href="//commons.wikimedia.org/wiki/File:Polo_Grounds_original.JPG" title="File:Polo Grounds original.JPG">Polo_Grounds_original.JPG</a>: Original uploader was <a href="https://en.wikipedia.org/wiki/User:Wahkeenah" class="extiw" title="en:User:Wahkeenah">Wahkeenah</a> at <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a></li>
<li>derivative work: <a href="//commons.wikimedia.org/wiki/User:Amada44" title="User:Amada44"><span style="font-family:Geneva;color:black;text-shadow:0px 0px 2px #00ff00;font-weight:bold">Amada44</span></a>  <a href="//commons.wikimedia.org/wiki/User_talk:Amada44" title="User talk:Amada44"><sup><span style="text-decoration:underline;font-size:smaller;color:gray"><i>talk to me</i></span></sup></a></li></ul>
<ul><li><a href="//commons.wikimedia.org/wiki/File:Polo_Grounds_original.JPG" title="File:Polo Grounds original.JPG">Polo_Grounds_original.JPG</a></li></ul>