My understanding of veneer trees would cause me to say that I don't think you have one there. Hopefully I am wrong though. "Yard" trees, or really any walnut growing out in the "open" are not likely to be veneer quality because of things that can be seen in this pic, lower limbs being evident here. Veneer quality trees are usually found in valleys in the timber, where the tree/trunk has to "stretch" to get sunlight v. surrounding trees and therefore has few, as in no, lower branches. Also, no burls, holes, etc....which don't appear to be evident on this butt log.
Here, that huge branch on the right probably "starts" 4 or 5 feet lower on that butt. (I agree with JNRBronc's assessment.) Notice the slightly darker vertical segment of the bark below that branch. Now then, that is a STOUT log and maybe the right buyer would be glad to get one that diameter???
Good luck!