I've just noticed that when I originally posted the thread I said my ebony LP Studio was a 1995. It's a 1993 model. With ebony fretboard. This many months later and I still haven't seen an Ebony studio with ebony fretboard. I guess they don't make them that way anymore. Is rosewood cheaper than ebony to produce?
"Early (Les Paul Studio) models featured dot fret markers on top of ebony or rosewood fretboards. In the mid 80's the dot markers were replaced by trapezoidal inlay. In the early 90's the option of an ebony fretboard was discontinued, but they are now available on the classic and alpine white finishes."