Hoary, There was a 350 pound anvil offered for sale in the tailgating section of IForgeIron a while back. You may want to check to see if it is still for sale.
Go to tailgating and then at the bottom left of the page, set the display options to list the posts from the beginning. The post was dated 03-27-2007 but I see no reference to it being sold.
The anvil was being used by a blacksmith so it has been properly trained to work. Face is 5 3/4" wide, 19 3/4" long, 1 1/4" hardy hole, horn is 12" long to the step block, height from base to face is 13 1/2".