Bas-relief
 

Good all day, dear friends!
I have to place this topic in the section ekspertiza.Za past it was found that the bas-relief - a copy of a bas-relief of Luca della Robbia " CANTOR ". Presumably the middle of the 19th century (but not deleted and the 16th century , as the nephew of Luca della Robbia Andrea organized a successful production of copies.
In the GMF is a cast of the entire " CANTOR " (in Italian courtyard ).
Maybe someone can tell you where to get information on the mark in the test ?
Sincerely,
Claire Sweet