Thank you so much for the information. I will see if I can find someone to jack up that portion of the anvilAccording to Anvils in America, they started using that design in the late 1930's and went out of business in 1953. On the front on the foot below the horn that's currently covered by the base it's on you should find a serial number. If you can get that, I can tell you the year it was made. If it is 500 pounds, in that condition it would likely go for more than $2000 out here in California. Prices vary a lot region to region though, they don't ship cheaply.