A 19th century micromosaic and black marble plaque

A 19th century micromosaic and black marble plaque, the serpentine moulded edge to five panels depicting the Pantheon, St. Peter's Square, the Temple of Vesta, the Colosseum and the Temple of Vespasian, the reverse with a paper label inscribed in ink 'St. Peters, Rome', 4.25 x 5.75in (10.4 x 14.5cm). Minor chips to edge.