I looked for a number below the Black Prince stamp. It was really obscured. Almost can make out a 15 but it's really small and obscured. This anvil sat outside a barn my entire life. It was my grandfather's and belonged to his dad before him.
I will be posting more pictures, I've got to wait until I get off of work. The stamping on the anvil was kind of faint. I just could barely make out the words Black Prince on the side with St. Louis.