Characters at 6 and 9 o'clock are Yuan Bao. This is another one with clockwise script. The other 2 characters are very worn, but I think that this is your coin:
Characters at 6 and 9 o'clock are Yuan Bao. This is another one with clockwise script. The other 2 characters are very worn, but I think that the coin is one of these:
Not disagreeing, but I think it looks like a Kaiyuan Tongbao. The top portion of the character to the north of the coin closely resembles the “Kai” in the Kaiyuan Tongbao.