Check the information, there are Wanli Bao Tong regular script on the Internet, which is 7.7 cm in diameter, brass, square hole, bare back copper coins, and the price is tens of thousands. I'm afraid yours is higher. Of course, it may also be forged. Look at the rust on bronze. If it is old, it is something of great value. It is rare now. Worth collecting.
My conservative estimate is: 200,000.