It's an I Ching coin, called the Tao-Kwong. The characters that are apparent match, although the 'font' tells me it's pretty new, as the forging molds wouldn't have been as precise as on the coin you found. It's a very auspicious find
I've got a set of repros that I found at a thrift store. I bought it because it had all the dates listed for the various ones, and since I find those from time to time I can then date them. Anyway my point is that those little tiny bumps are on every single one of the repros, in an attempt to make them look old I guess...
Soupie I think yours is an original chinese cash coin, from the Chia-Ching dynasty, circa 1796-1820. (my repro set at work)