Dayam, I wish I had nice finds like that.
On Athens, that bow wouldn't be worth more than 80M. A normal SoM Bow is worth around 35M-ish... but SoM+5's go up to around 60M.
400M is definently way too much. 200M would be the most that most people would pay for a Sun+4.
But great find, regardless - you definently made a profit, no matter what, considering that RedSea is one of the newer servers.