This substantial old bronze chinese coin was among those made and circulated in China from the 4th century bce through the early 20th century.
In the modern era, these coins are considered to be Chinese “good luck coins”, they are hung on strings around the necks of children, or over the beds of sick people. They hold a place in various traditional Chinese techniques, such as traditional Chinese medicine and Feng shui.
Here it hangs from double links of brass chain which closes with a large hook in the front. The chain is 19 inches long and the coin is 1-3/8 inches across.