The actual fight took place on August 13th 1881 which was a Saturday night and was scheduled for four rounds.
Boxrec has the venue identified as McCormick Hall (but there are at least a half dozen McCormick Halls spread across the Northeast, most being on Ivy League College campuses.).
Here is Boxrec's description of the event: http://boxrec.com/media/index.php/John_ ... mes_Dalton
This poster has Sullivan fighting on August 13th 1858 (which happened to be a Friday night) about 60 days before he was actually born, supposedly at the Boston Area, and has the fight scheduled for 20 rounds.
Plus has anyone ever heard of "Straight Rules" ?
There have always been forgeries created to rip off collectors; with the Jack the Ripper murders ripping off collectors (pun not intended) with forgeries is a cottage industry, but I was unaware that this happens with Boxing Memorabilia.
It would too easy for a collector to confirm or disprove this poster's legitimacy, so why would a forger create such an obviously bogus poster? Is there another explanation why someone would create this bogus poster?

