That's a rifle blank. Bastogne walnut is a RARE cross breed between a Claro Walnut and an English Walnut tree. I did a quick google for a Bastogne walnut rifle stock blank and see a prices in the $550 and up range.
Bastogne walnut can be a very expensive wood up grade on any rifle. Besides knife scales, it's used in very fancy wood work as inlays. IIRC the mantel clock I bought my wife has some on it.