Jerry Quarry vs Scrapiron Johnson (the ko)..and Quarry vs London...these fights may exist on film, but they may as well not exist for their inaccessibility.
How about Joe Jeanette vs. Sam McVea after 49 rounds? As much for the huge sigh of relief from the crowd, who can finally have a toilet break after 49 rounds of intense action?
christy williams knocked battling nelson down 7 times. but...nelson knocked williams down 41 times before ko'ing him with the 49th knockdown of the fight....i'd like to see that one too.