90% sure it was 600 grit US, dull, like so many dull, solid Super-Flex in that era, intended for heavy oil. Even today that surface, that cover and that core (super low RG, 2.45, very high flare, like 7-8") is going ot need a lot of oil or high ball speed on medium oil.
Here's some copy from that BowlingBallReviews.com web page
AMF - Whiplash
Description:
An AMF core with a Columbia coverstock means a new level of performance. The AMF design features a denser core that's double-shelled for dynamic integrity in every weight. Combine that with the Super-Flex Resin II coverstock from Columbia 300 Inc. and you're up a notch in power and control.
Specifications:
Line Whip
Color Red
Coverstock Reactive
Core 2-piece
RG 2.450
Factory finish Matte
Weights 12 thru 16lbs
Lane Conditions Heavy Oil
Cleared PBA 2/8/1998
Cleared ABC 1/1/1998
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