I'm a big fan of that disc as well....I also like the KCPro Eagle too.
KC plastic was made for Ken Climo after his World championships. 8X, 10X, etc each refer to a different year, and a different blend of plastic. Im not sure how far back the KC plastic goes, but the oldest i have seen would be a 7X.
"eleven time world champion" is stamped right on the disc, and i beleve it has been every year since the plastic came out (not 11X of course, the stamp changes each new blend of plastic), so it shoulnt be hard at all to tell which year it came from.
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