What materials were used in Zingraff Paris opera glasses?

Zingraff Paris opera glasses used a mix of functional and decorative materials. The main structure was often made from brass, chosen for durability and ease of shaping. Lenses were crafted from optical glass, usually ground to provide low magnification suitable for indoor use. Outer finishes varied widely. Some models used mother-of-pearl panels, which gave a reflective, iridescent surface. Others featured enamel coatings in colours such as black, cream, or deep red. Leather coverings were also common, especially on simpler designs. The focusing wheel, placed in the centre, was typically metal with fine ridges for grip. High-end examples included gold plating or engraved patterns. Cases were made from leather or fabric, often lined with silk. These materials show a blend of practicality and style, reflecting the dual purpose of opera glasses. Surviving pieces from the 1890s often show wear on the finish, though many still function well today.