The set looks to be in great condition and so is the sale price as well.
IMO, the cue ball looks to not be original to the set but shouldn't matter.
Heck, I seldom use the Centennial cue ball & all of my Centennial sets
use a Aramith measles ball that's the same weight as the object balls.
This is a steal of a deal for anyone looking to score a set of Centennials.