I agree it is probably geniune and that one mark does look suspect, it looks exactly like a depression, but it could also just be a normal contact mark. Even if it is a depression, one depression isn't enough to deem it counterfeit. It seems to have good details. Good purchase! Sent it into PCGS or NGC and see what happens! I really like NGC's holders, the edgeview is nice, just an overall better holder. I think if it's in a PCGS holder it may sell for more though at the same grade of an NGC coin. Oh and the black mark, it could just be wear or it may be a grease mark. I once had a gold angel that had a grease mark on it.