Coin across Drael and Sirasea is a standard weight, so they’re worth the same amount. Sirasean coin stamped on one side with the Circle of the One and on the other side with the sand dragon, the symbol of the Royal House of Sirasea.
Draelian coins are stamped with a ship on one side and a horse on the other.
100 coppers = 1 silver piece
100 silvers = 1 gold piece