It is a Trenton.
I've seen Farrier anvils with horns bent to the side, supposedly to make working shoes easier on the smith.
I let an anvil get away this weekend, myself. Ran the guy up pretty good, but didn't want it as bad as he did...yeah, I'm THAT guy when it comes to anvils.
The face was mushrooming over the side, anyway, which led me to believe it was probably in a fire that annealed the hardened face somewhat.