I bought this anvil at Rock Island Arsenal from a liquidation auction. They decided to auction off entire contents of one huge building, because they wanted to renovate it.
This anvil is 33 inches long and weighs approximately 340 lbs. I tried to measure rebound by dropping a 1 inch diameter hard bearing ball on it and measuring how high it would rebound. My best attempts at measurement ended up with rebound at 85-90%. Update: after cleaning up the top surface, rebound improved to 90%.
This anvil came with a combination cast iron/wooden base. It also had a "shelf" that can be mounted in the pritchel hole.