It's nothing to do with "trusting" eBay - it's the sellers in whom you must place your trust.  They have given high definition photographs and you should grade the coin yourself, and only use the grade they give as a guide.  Also, there is no reason not to trust a person with so high a feedback rating. I know nothing on Roman coins, so I don't even know if EF can be applied, but it looks in stunning condition.  Also, it looks like it was previously gilded, as there are hints of gold around the obverse edge beading, between 9 and 12 o'clock.  The figure on the reverse also has a gold haze around the edges. Buy it if you like it!