Well i went to look at the anvil today but i didnt have a ball bearing or ball peen hammer. I used a framing hammer and i could hear a ring all over but the tone was lighter in the middle on the face and on the side of the anvil. There was alot of surface rust and pitting. He said he would take 300 and hold on to it for me while i did more research on it.
Also he believes its a trenton but not sure, he found it burried in his back yard.