So I finally got a copy of the catalogue (more of a flyer really) of the recording custom line from 1990 (I think) which shows the cobalt blue as a color option. It also has the "force" version (deeper toms). I've been looking for a while and found older and newer ones but this is the one I picked my sizes from in 1993 or so. They discontinued the cobalt blue right after I bought my kit and never reissued the color.
Anyway, I thought there was a download section for this sort of stuff. This one got wet in the rain unfortunately but I opened it up and dried it out. It is a bit wrinkly unfortunately.
It was cool to look through it again.