Not an expert by any means, but they definitely came in both sunburst and radial finish. I don't know whether both variations were (originally) available on all models, but I like the starburst pattern better. When my 911 (in a 910 case) was overhauled last year, I opted for sunburst even though the original finish that was still faintly visible when I first purchased it was radial.
I posted photos of the work (and its paperwork and price) on p. 20 of this thread; unfortunately, the resolution isn't high enough to see the finish very well. Could not recommend Official Time Watch (in Utah) more strongly.