I have seen a display or two like that online, with a Hall cabinet and N173, that gave me pause as to their authenticity. I'm not saying that the display you saw was not authentic, but that I would want to see everything unframed before making a final determination.
Also, the third photograph is of a touring team put together by Jim Hart:
http://www.robertedwardauctions.com/.../2004/304.html
Thanks for posting this information. Is there 19th-century baseball material there every year?
Charles