As Mackaydon already said, it is a Jia Qing Tong Bao 1 cash coin of the mentioned date. The inscription reads 嘉慶通寶 and means "currency of Jia Qing" The ornamental writing on the back is Manchurian because the Qing dynasty, which this emperor belonged to originally came from Manchuria where a form of writing was used that was different from the more well known Han-Characters.