Lithophane - 1850 - 1870 - P.R

Three pieces of lithographs from the 1860s.
It concerns an intaglio engraving in very fine porcelain, which is only clearly visible when the back is illuminated with a light source.
Then a gray scene appears.
Three romantic scenes are presented here (see photos).

Two of the three bear a signature (P.R. in a saw figure) next to a number. (see photos)

These three measure 11.5/10 cm. They are free of visible defects aside from some signs of use.
This porcelain is becoming increasingly rare.
They have two holes at the top, allowing them to be hung on the wall.