There's a book by Richard Postman called Anvil's in Amreica that will have most, if not all the info. you're looking for on the Henry Wright.
From the little info I have, Henry is believed to have been a relative of Peter Wright (more popular/well known) who also made anvils in England during the middle 1800's.
They are considerd a quality anvil. They're cast steel not iron which is desireable & if in good shape, clean edges, flat table, good hardie & pritchel holes, they can command a good price these days depending on how bad the buyer wants it.
Larry