Silver Dragon coins, also sometimes known as Dragon dollars, are silver coins issued by China, Japan and later Korea for general circulation in their own countries. Featuring a dragon on the obverse of Japanese and Korean issues and on the reverse of Chinese issues, all were inspired by the silver Spanish dollar which following its introduction into the region in the 16th Century had set the standard for a de facto common currency for trade in the Far East, this specification being a weight of 27.22 grams and a fineness of .900; the coin thus contained 24.5 g (0.7876 troy oz) of silver.[1]