A pair of French brass and guilloche enamel opera glasses, circa 1900, with maker's mark of Jules Carpentier, the jumelle glasses with folding handle finely decorated with blue enamel, floral sprigs upon a pattern pink guilloche enamel ground, with mark of Jumelle, and Carpentier to the frame, Carpentier was an inventor in the field of optics, pioneering early cinematic cameras as used by the Lumiere Brothers, width 11 cm