Thanks - that led to a lot of googling. Horse bookends seem to be a complicated field, and these have been made at the very least by Fostoria, New Martinsville and Smith bros. in the 1940s - and possibly by others. Most items I see on the net are lacking in definition, and there is discussion on how to distinguish between the various makers. Of course, finding one of these in Europe is a rare occasion - no wonder I've seen it but not recognised.