The Bull Whip was hand buffed, not machine polished. While this doesn't rule out a 2000 polished finish, I don't think that it was that high. This may have been one of the last balls manufactured by Ebonite for AMF. It came out about a month after the Pearl Whip, which had the same coverstock as the Swirl, Ultra/C and Ultra/C Pearl, which were Ebonite manufactured balls.
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Why change balls? I can miss my target with any of them!