Raimey, I've no idea. Most of Reifs here are postwar, and I seem to remember that when a pre-war showed up, someone suggested Reif was deliperately marking some of his new guns as prewar, since after a while the customers caught up with the fact that prewar quality was better. But this is just speculation.
Dave, that would be mother-of-pearl. There is a persistent idea in this country that a high-end shotgun must look like a Fabergier egg with two barrels. However, most of these guns are made as gifts and seldom get to be fired.