My go-to anvil is a ~100 lb. Armitage Mousehole pattern anvil that I rebuilt (new horn and face). In the basement shop I have a small anvil made from a length of railroad rail that I made primarily for sheet metal work but it has some pretty heavy work done on it with no signs of wear after forty+ years.
A solid and massive mounting for an anvil will compensate for less mass in the anvil. Forging is a matter of displacing metal and to do that effectively an immovable backing is used. My rr rail anvil is mounted on a white oak pedestal
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Centaur Forge is in IMO the premiere supplier of anvils in the USA. I knew the founder close to fifty years ago.
https://www.centaurforge.com/Anvils/departments/141/
