There are pictures of the “Copper” orientals on Ravnheart’s…and if you think the resemblance between this and the Bronze is off…well. Here, I’ve lined them up all together.
Mystery :

Bronze :

Copper Gold:

Copper :

Sure, the picture could be off enough for it to be a slight variation of the Bronze, but I just can’t see it being one of the Copper set. Maybe it’s a “Bronze Gold”? Or perhaps a “Sunrise” sun dragon. Heh.