If I were to guess, I would say it's a Peter Wright for the following reasons:
1. It has a similar overall shape to other Peter Wrights I have seen.
2. It has flat ledges on top of the feet. Peter Wrights were known for this feature while few other brands had this.
3. Peter Wright seems to be the most common brand of anvil in the larger sizes in Canada. I realize this is a purely empirical observation, but it seems to fit given my above 2 reasons.
It appears to me that a previous owner tried to get rid of a rough edge of the face plate by cutting it off, first with OA, then by machining/grinding to get a crisp, square edge.