As you probably know, Matthew, most coins from ancient China have holes at the center, like the example shown here. Also, none of them, at least as far as I know, have an explicit date shown in Arabic numerals. Perhaps the grade (Extra Fine, EF), and the date (1643) are written on the cardboard holder your coin is in.
Common, well worn, small (about 20 mm diameter) Chinese cash coins sell retail for $3 to $10 US dollars when in average circulated condition. Larger coins in well preserved condition can approach $100. A 1000 cash coin is big, heavy, and impressive (about 65 mm in diameter). These sell usually in the $200 range if in good shape.
Our favorite web site on ancient Chinese coins, charms, and amulets is PrimalTrek.com. Be sure to visit if these coins pique your interest. In addition, SportsTune may be of help.
If you like, start an e-mail exchange with CoinQuest using the Contact Us link at the left. Then we can send pictures back a forth to try to identify the coin and its value.