FWIW, my circa '84 Serotta has SLX fork decals - at least, it has smaller versions of the red SLX decal affixed to the forks. Not sure what this means, or doesn't mean. What I do know is that John Barron scored a very nice, very drilled-out Paramount very recently, but I'm certain it wasn't SLX.
Ed Granger
Lancaster, PA, USA