Warrior,
As ozsweet wrote, your ball is a 1987 version of the Yellow Dot. Columbia produced the "Velvet Touch" bleeders from 1979 to 1984. In 1985, Columbia changed the Yellow Dot coverstock formula to a strange blend that appeared to be part urethane. Supposedly this was done to eliminate the cracking problem earlier Yellow Dots, particularly bleeders, were notorious for. The new coverstock was definitely more durable, but nowhere near the same ball (good or bad). These new YD's were more porous and textured like their all-urethane contemporaries, whereas the VT bleeders were 100% polyester and were softer but smoother-surfaced. In 1990 or thereabouts, Columbia re-engineered the Yellow Dot again, emerging as the Yellow Dot Legend. The Legend had a shiny, deep maroon/burgundy pearlized shell like a bleeder, but it didn't bleed. It was pretty much a White Dot by then.
It would be hard to tell if you have a urethane YD by sight if you knew nothing else about Yellow Dots. But if you could put various versions of Yellow Dots side by side, the differences between all of them would become apparent. As it stands, the only way you'd know what you own is by the serial number, and knowing what the serial numbers mean.
