The mon looks like it is bronze, which would place it at the 1600s up until the mid 1700s. The Japanese copper mines started running dry, so the composition of these coins was almost exclusively iron by the early 1800s.
Supposedly the calligraphy style can be used to trace it to a specific reign; I'm not 100% sure how to do that, however. Yours is in very good shape.
The Kao Tsung cash (AKA qianlong) is by far the most common coin from the entire 18th century. These were made literally by the billions to fuel China's massive economy at the time.