Ancient Chinese Coin

It dates back to the Chongning era (1102-1106) during the reign of Emperor Huizong.  The inscription reads "Chong Ning Zhong Bao," meaning "circulating treasures of the Chongning era".  It is a bronze coin with a square hole in the center, typical of Chinese coins from the 7th to 19th centuries.  This coin is a 10-cash coin.  The characters are in "slender gold style" script.  The coin's dimensions are approximately 3.5 cm in diameter and 2.2mm thick, weighing around 9.8