Photos provided by Ken Skaught, Medallion Estates, digitally processed by Jock Dempsey.
Grid is 1" (25mm) square behind, and 1/2" (13mm) lines below. No dimensions provided.

This appears to be a hand made, one off, bench or jeweler's anvil. It is not very well finished and the horn is a rather ugly and difficult to use shape. See The Upturned Horn an Anthropomorphism

Weight is around a pound. Large for a jeweler's anvil, small for a bench anvil.