It's listed with a photograph in R. Leonard's book "Curious Currency". It's called a K'a K'im. The notes read as follows "Even odder than bullet money is the K'a k'im of Northern Thailand. These curious rings - split and bent into the shape of a women's pelvis-were used as money circa 1325 to 1545. They are stamped with a denomination, dynasty symbol, and name of the mint city." This sounds logical since Chiangmai is a popular Thai tourist destination.























