Well, as fir gettin' into what the image is, that's allready been covered very well but as for the medium... Cluin is most certainly correct in that it is probably an etching and I hate to burst anyone's bubble, especially if it's Sorcha's and she thinks that it's worth a bunch of money but it probably isn't... There were thousands of very good etchers in the 19th century and thousands of books containing thousands of etcheings as etchings were the way books were illustrated...

This particular one most likely was cut from a book and not produced as a work of art but as an "illustration"...

Sorry, but that's my opinion and though I could be wrong I not only have lots of old books filled with these kinds of illustrations but also have a B.A. in "Painting and Printmaking"....

One thing fir sure, it ain't no Durer...

Bobert