It also has been seen in several Red Zones. Like Rico said, it usually occurs on the first "so-many" balls molded right after a run of pearls were made if the lines were not flushed properly. I really liked my Red Zone "pearl". I also had a Strike Zone "pearl", but I needed more hook than what it gave me, especially on the carry down. They DO look good though.
RoB LaW
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I'm gettin' old, I'm hurtin', but I've got Brunswick balls.......Color me competitive.