You have what looks like a very nice Peter Wright anvil. The numbers on the bottom is the weight in the british system or hundred weights. The first 1 is 112 lbs the second number is quarter hundred weight or 28 lbs. so 0 on that and the last number is just lbs up to 28 so 18 is what yours is stamped. Add it up and you have 112 plus 18 for a total of 130 lbs for the anvil. As for the value that varies alot on condition and weather or not the individual is buying or selling. If the face is nice and flat, edges crisp. no cracks, has a good ring tone the value of that anvil is 350 to 450. Now if the anvil edges are poor the top is not flat. The Anvil would need a rebuild to be useable. So a 100 is the fair price. The peter Wrights are a very well respected anvil Company. They are becoming harder to find. If you can use it, Keep it. If you decide to sell it PM me. I always have room for a good anvil.