All I've seen were plain walnut with a Monte Carlo comb.
I bedded my 375 into one of the Featherweight SuperGrade stocks that were all over ebay and CDNN a few years ago. Just have to open the barrel channel a bit and make room for the "knot". Makes for a trim and attractive package but about the same weight since the Alaskan forearm is hollowed out, at least in the 375 versions.