References: J.Bourne, V. Brett, "Lighting in the Domestic Interior," Ph. Wilsor, 1995, fig.561.
The punched signature *OPUS*G.C.* presumably belongs to the sculptor who created the models. In the pedestals there are the following punches: "Z.F." with the sign of an organ and "A.C." with a tower, mark of the public assayer (Pubblico Sazador) Anzolo Castelli (already active before 1682-1700). Essay by Dr. Charles Avery
