This one is similar to a U-18. It has cool unglazed areas. This always reminded me of some prehistoric cave paintings! This is one that is better looking in hand than in the photo. It has a weak MLOD, and the glaze has fine darker brown specks. It is made of dry process porcelain, and has a glazed pinhole. Unknown previous ownership. Black spots are from camera, and are not found on this insulator.