Offered is a new old stock bottom swage made by W-something Forge and Tool (it is marked with a W in a circle flanked by an F and a T with an ampersand at the bottom). Nicely made, it has never been used. Shaft is 3/4 inch, so it would fit perfectly for about a 100 pound anvil, or you could use a sleeve for a large anvil (Centaur and others carry them, or you could easily make one). It is very well made and will give you many years of service. Please see my other auctions for the matching top swage, as well as some other excellent tools. I combine on shipping. Maximum shipping is $8.10, so if the calculator says more (or you buy the matching top swage or other items), figure on $8.10 for Priority Mail shipping. E-mail with any questions. Good luck.