My dad had a standard production anvil in his shop. No idea what happened to it.
He also had a portable anvil he used when he was setting horse shoes. It was made out of the drive rod from a junked, Baldwin 9600 steam locomotive. The horn wasn't offset like those pictured, but the face was wider than standard production anvils. It was good for making sure the shoe was flat.
I know where that anvil is.
My "anvil", such as it is, is a 20" section of 90 lb rail.