I have no idea about this item, I found it within my late aunts belongings. It features a scene of Highland cattle which to me looks like it’s a photograph negative which has been somehow put onto the metal plate? I don’t know how else to best describe what I see. Its onto plate metal which is solid and ridged. The flat plaque measures 31x26cm My best guess is that it’s Victorian Antique? The Highland cattle aren’t raised, so I don’t think it was used for some form of printing? like my best guess has this been like a photograph negative plate? It’s an usual and decorative piece I just don’t have any province for it. Condition is as identified from my photos.