Set of antique theatre binoculars, 19th-20th century

Set of four period opera or theater binoculars. Made of brass and metal with decorative coatings, characteristic of the late 19th and early 20th centuries. The lot includes three with gilt brass mounts and exquisite mother-of-pearl inlay, and the fourth with dark mother-of-pearl. (Two of them have matching extendable handles or impertinent grips, and one has faceted objective lenses.)

Size: 6 x 14 cm (white mother-of-pearl with mount); 6 x 12 cm (striped mother-of-pearl with mount); 8 x 11 cm (dark mother-of-pearl); 7 x 10 cm (white mother-of-pearl)