[Arran]

What I would do is see if you can find a picture of your set somewhere, I think that radioattic.com has a photo archive, as does antiqueradio.com, then you could find out for certain. When I meant top veneer I should have said the top layer, it's what would have been typically used on the sides of the cabinet, but it depends on the make and model of course. In addition to the walnuts (of which they often used French/European walnut not strictly black walnut) or the mahoganys they often used a species called Australian Walnut, it has almost a horizontal striped look. If there is some of the original veneer left take a look at the website of a outfit called " Albert Constantine's" to compare, they have photos posted to help identify each species.
Best Regards
Arran