I seem to recall Sandra's piece had a red stamp on the back... her pics have gone though... Sandra if you're still reading this, could you please repost your images for us to compare with David555's piece? Mine doesn't have any markings on the back at all, also the backing on mine looks and feels like pigskin rather than paper... although I'm sure that there will be more than one maker of this type of work so variations in backing are to be expected I suppose.