Gather a block of iron or steel
Heat the metal in a forge until it is red-hot
Shape the body with hammering or by casting in a mold
Form a flat top surface
Form a horn on one end
Add a hardy hole and a pritchel hole
Normalize and harden the working surfaces if needed
Temper the metal to reduce brittleness
Grind and smooth the striking surfaces
Mount the anvil securely on a stable base