From: Illustrated and Descriptive Catalogue and Price-List of Optical Meteorological, Mathematical, and Engineering Instruments. Manufactured and Imported by James Prentice & Son, 176 Broadway, New York (no date)

While the microscope shown here is unsigned, a number of examples of this type of microscope are known with different signatures as follows:

 

Radiguet & Fils, Optns 15Bd des Filles du Calvarie, Paris

Radiguet et Massiot, 15 Bld des Filles du Calvaire a Paris

Maison de L’ingr. Chevallier, Optn, Pont Neuf 15, Paris

J. Bianchetti, Marseilles