Looks like a Gargoyle to me. Gargoyles are usually Cinnamon Het Red Axanthics, but can also be Black Pastel Lace Black Back. Lace Black Back, Black Pastel, Het Red Axanthic, Cinnamon, Huffman, and other genes are all part of the same complex. While it is generally accepted that Black Pastel and Cinnamon are different genes, they act in very similar ways most of the time. It is also believed that Lace Black Back and Het Red Axanthic are either two different lines of the same gene (like Lesser and Butter), or two different genes that act very similar (like Cinnamon and Black Pastel).
World of Ball Pythons has both a Cinnamon Het Red Axanthic and a Black Pastel Lace Black Back as a Gargoyle:
http://www.worldofballpythons.com/mo...-red-axanthic/
http://www.worldofballpythons.com/morphs/gargoyle/
The snake you are looking at buying looks real good.