an old topic, factory finishes are almost impossible to replicate. Just looking at the one I have left it apprears to have 4000 over 500, very dull or matte finish. Most finished like this use the 4000 abby for a very short period, used to roll the edges of the 500 over, this allows for traction or to keep the ball from skidding too far, but pronounces the recovery aspect of the ball. Very light pressure with very few passes with 4000 are generally used for this finish.