OH that is easy LOL it is the frame they used in '89 for the Giro, Super Leggera and Mondiale. all there shared the same frame and I think even the decals were the same but I have to dig out the catalog to be sure. it was also available as a frame only in '90 as a Mondiale and I am sure a few were sold later than that but to my knowledge '90 was pretty much that last year for SLX especially with that decal style.
you may want to look at a Phill wood or the VO BBs. not bad for only $35
http://www.velo-orange.com/grcrubobritt.html
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk