Looks VERY like a WM weight to me! The 'ripple back' is almost trademark Willie. The finish on the back (with the ripple) is not dissimilar to his 'Batcave' weights. Like Nick77, though, I'm surprised by the lack of a signature cane or at least scratch-signed to the base. Maybe a test piece? Or possibly a Masterclass output? The flowers look a little unusual for a Willie production piece.