[CarltonHendricks]

Wow that thing is great...you're talking my language I'm Mr. Broadside...If you decide to move that let me know (along with that cheezy Yankee stadium architectural letter M :-)....I've got a Cornell one that has 1877 written in pencel that I got from Mark Rucker 20 years ago, see below..and the Harvard Yale one below, which is also from 1877 the same year the catchers mask was invented at Harvard. At the very bottom is probably the most incredible baseball broadside I've ever seen....I took the shot at the 2009 National in the booth of Kevin Bronson.

Very good question on the earliest Pro baseball broadside...I'll have to give that some thought as nothing pro comes to mind...the very early pro ones must be very rare...