How do we know this is a real coin and not a replica?
I know it weights the correct weight, and looks exactly the same as many others, but there is no way I can prove it on line. You just have to look at the photos and video, and consider my selling history: so far no one has ever complained about receiving a fake coin.
PS. Also: good quality fake coins of that size are very rare. The only I know of are actually filled with platinium (they were minted at a period when platinium was cheaper than gold), and are now much more expensive than real coins.