Attributed to Polidoro Caldara, called Polidoro da Caravaggio

E. Blum, London (his mark, not in Lugt)

Window mounted and laid down on Japan paper. A few small tears: on the right top edge visible in the catalogue, two on the bottom edge and one on the top left edge in the lower section of the drawing. Surface is slightly rubbed and stained a bit overall. The chalk is sharper than in the catalogue illustration.
In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective qualified opinion.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING CONDITION OF A LOT, ALL LOTS ARE OFFERED AND SOLD "AS IS" IN ACCORDANCE WITH THE CONDITIONS OF SALE PRINTED IN THE CATALOGUE.

According to information given by the previous owner, the attribution to Polidoro da Caravaggio was suggested by John Gere.  The three figures do not seem to relate to a known composition.

We are very grateful to Rhea Blok of the Fondation Custodia, Paris, for indentifying the collector's mark.