Willie Pep, Maxie Rosenbloom, Pernell Whitaker, Nicolino Locche, Tommy Loughran, Kid Gavilan, Miguel Canto, Joey Archer, Ivan Calderon, Sven Ottke, Jimmy Young, Joey Maxim, Billy Graham, Willie Pastrano.
Jack Britton, best Welterweight pure boxer, had 344 bouts and kod but 28 opponents. So great a boxer was he that he went about 330 bouts without ever being stopped. Astounding...
I wouldn't exactly refer to Pep as being feather fisted. He broke Bartolo's jaw with a single punch, scored a pretty respectable 61 KO's during his career, and scored kd's in many of the fights that went the distance. He didn't hit like Saddler at featherweight...but who freaking did?