Italian micromosaic plaque of the Imperial fora - Rome 19th Century

black marble from Belgium and lapis lazuli, the micromosaic depicting a view of the Imperial fora with the Arch of Septimius Severus, the three surviving columns of the Temple of Vespasian and the Temple of Saturn.
Height x width x depth: 1.2 x 14 x 10 cm. Weight 405 g.
Item condition grading: **** good.