It reminds me very much of my Dartington perfume bottle - from their Kyoto Studio Collection c.1993. I'll post an image later when I have more time so you can see the similarity. I do have a William Walker vase which is from his Chinese range, and I can see why some one might suggest him, but the colours are much more delicate and muted unlike the Dartington one which is much more vibrant like yours and my perfume bottle.