Mother-of-pearl opera binoculars

Old opera binoculars in brass and mother-of-pearl good general condition, in their original leather and satin case perfectly functional. The focal length is easily changed by turning the top dial, also in mother-of-pearl. Brass patina, some small paint skips on the black circles tablet work late 19th century / early 20th century width: 10 cm length: between 5.5 and 7.5 cm external dimensions of the case: 11.5 X 5 X 6, 5cm.