This is a nice insulator, a bit odd coloured, but displays great, especially when in a lit case. Embossed CALIFORNIA (DOME) A.Colour I'd call a yellow sage, as the yellow is easily seen when seen in person. The base on this looks to be a round base rather than smooth base, the curvature is way to round to be SB.If it is a RB, then it would be unlisted. Condition is superb, has 2 tiny pinpricks that I can see and that's about it. Book for the yellow sage is $30+. My price...$26 delivered.