This generation of wood dial Day-Date is often referred to as burl wood which is
link theoretically correct in that burl is a specific grain characteristic
link that is present on the later generation of wooden dials. But burl is not to be mistaken as a type of tree like birch or walnut. Burl is actually
link a growth that forms on the outside of a tree and in turn affects the grain pattern producing unique knots in the wood.