Lion of Babylon block of 4 on cover from a 16v definitive set. This impressive basalt lion is carved in Hittite style, over a human figure, which is easier to see in the image below. It was unearthed in 1876 by German team and can be viewed today in the ancient city of Babylon.
Here is the lion in 1909, today its features are much less sharp, from exposure to the elements and tourists. Photo credit here.