Three pairs of French opera gilt-brass opera glasses, late 19th century, to include: a tortoiseshell example, the bodies with gilt pique work and floral vignettes on a ground with gilt stars, the eyepieces marked Ducatillon Ingr Opticien 29 Bd des Capucines Paris, 10.5cm wide; a pair with black lacquered bodies with white metal cartouches and floral inlay, 11cm wide; and a pair with black lacquered bodies, 10.7cm wide (3) Three pairs of French opera gilt-brass opera glasses, late 19th century, to include: a tortoiseshell example, the bodies with gilt pique work and floral vignettes on a ground with gilt stars, the eyepieces marked Ducatillon Ingr Opticien 29 Bd des Capucines Paris, 10.5cm wide; a pair with black lacquered bodies with white metal cartouches and floral inlay, 11cm wide; and a pair with black lacquered bodies, 10.7cm wide (3)