Very many arguments, but some of you conflate, and some of you confuse. I've seen above, some of you think he quit on 526, 589 and 609. Some have cited videos. I think, here are the facts. Feel free to correct me, but if you do, at least come with evidence.
The 526:
From Willie, on an interview with ABC's Wide World of Sports, Bill Fleming, Willie said he quit after the run of 526. This video was quite a while ago, maybe the 60s or 70s. Willie was not showing any signs of Alzeimers in that video. In fact, he was perfectly healthy in the early 80s legends tournaments in Atlantic City. So let's put the Alzeimers to rest as an excuse for the early video recount of quitting at 526.
Still on 526, When Willie played Jimmy Caras later in life, Pat Fleming asked him how the 526 run ended. Willie said, he quit. That was quite later, and I think Alzeimers, plus some surgery may have had some effect on his memory. Given evidence, I do think he missed on 527.
The 589, Charlie Ursitti does provide some history, that I've provided below, and I do take his word that he quit on 589.
The 609, is a bit of an enigma. Willie says he did it, but does not describe the ending. I've provided that below too, even though I've shown it on another thread. Some of you think he quit on that too, and I'd like to see evidence. So far, I've not.
I like documentation rather than hearsay, but admittedly, if I know the integrity and character of a person, that goes a long way. Anyhow, hope this provides some clarity, jogs some memories, etc. Also hope it fills in some holes when you talk about some Mosconi video. There is an earlier on with Bill Fleming and a later one with Pat Fleming.
All the best,
WW