Those were some of the best finishes they ever had.. and I can't believe they don't offer them anymore... Each shade available at that time had the same natural background sort of "burning" through.. I don't know how they did it but I've never seen anything like it......... The current birdseyes they have DON'T have the same characteristic.
They were engineered veneers made by Alpi, just about all the natural woods that Sonor offer now, with a few notable exceptions (Scandi Birch, American Walnut and a couple of others) are from them or similar, including bubinga, the Mkassar ebony etc. You can still buy those Tribal veneers directly from Alpi.
Nothing wrong with that and far more tree-friendly!