Look the sides over carefully especially if it is painted, or real dirty, I've run across a couple of medium size anvils that were welded back together. The welding was definitely not factory stuff. A big anvil MAY have escaped some of the abuse a farmers anvil may have suffered. One that big was more than likely in a professional blacksmith/welding shop. And didn't spend a few decades in the barn where the grandkids pounded on it with any old hammer, because (anvils are made to be pounded on, right?) I would say that a 250 pounder, with that good name, would bring a full 3 dollars a pound. In exceptional shape. Chips, swayback, and general wear start knocking down the price.