https://www.ballreviews.com/columbia-300/yellow-dot-bleeder-308133/https://www.mrbowling300.net/post/yellow-dot-bleeder-6982768https://bowlingballexchange.com/showthread.php?t=44333Probably in there somewhere.
(edit: Here we go, sorry looks like not a bleeder as bleeders were all 1970s balls but not all 1970s YD balls were bleeders . - The Yellow Dot remained in production for a long time, from the mid-1970s into the early 1990s I think. If the serial number begins with a 3 or 4 it was probably a 1983 or 1984. Later balls had the "Legend" logo on the visible side away from the label, following the practice introduced by Hammer in the early 1980s. By the early 1980s Columbia had figured out how to produce a more consistent ball from batch to batch. The color is one clue. The bleeders were darker, with less scarlet and more purple in the color. Many of the 1970s series balls never bled, and some balls produced before the hardness rule went into effect in mid-1976 were too soft. Bleeders were also prone to cracking around the holes ... )
(edit2: Looks like the bleeders mostly start with 5P, 6A, 9O(?), 9P, 9Q, and 9R)
Btw if come across a Purple Sumo I can tell you that is a beast of old school polyester ball. Almost as soft as the bleeders and with a giant core as well (yellow dots all 3 piece). I can use that bad boy on half the houses in the area even today. Heard the Ebonite Clear Wolf was a beast as well.
