Came across this interesting article from the Syracus Herald (1-27-16) about Jack Monroe.
"Jeffries arrived at Butte, Montana, where Munroe was working as a mine boss in December, 1902. Jack was a handy man about the camp with his fists and he didn't hesitate a moment when Jeffries offered to meet any man in town for four rounds. If he failed to knock out his victim Jeffries agreed to forfeit a substantial portion of the gate receipts. Munroe not only went the distance but he succeeded in bringing Jeffries to his knees with a punch. Jim always claimed he slipped on a wet spot but that didn't prevent Munroe's name flying round the world."

My comment--This is report from years later, but the Jeffries reference implies that Jeffries had conceded that he went down in this fight.

Do you have any knowledge about a Ketchel v Langford film? I'm almost
positive it exists because I remember seeing stills from the fight (I think
it was in RING, but that was maybe twenty years ago.

The book is actually titled "In This Corner...Forty World Champions Tell
Their Story". It's available on Amazon. By the way Gunboat Smith got
into the book as "The White Heavyweight Champion Of The World".
It's a great interview.

do u think jefferies wouldve beat jack johnson in his prime?