With the flats on the feet visible in the first few photos, the extra handling hole between the front feet (a PW feature they used for grinding if I remember correctly) and the hundredweight numbers still visible, I would say this is a Peter Wright anvil. One that saw a lot of wear on the far side however, enough to wear off most of the markings except for the two outside hundredweight numbers. They must have had to make a lot of 90s or other work on the side to do that.