Used and clean, for sale for heritage enthusiasts. These are classic opera glasses (Theater Binoculars) from the Soviet era, specifically produced by the "Lytkarino" Optical Glass Factory (LZOS). Here are the details of the markings and symbols printed on it: 2.5x: Magnification power (2.5 times), which is the usual magnification for theater glasses to ensure a wide and comfortable view inside closed halls without image vibration. 24: Objective lens diameter in millimeters (24 mm). 60: Interpupillary distance (60 mm). The circular symbol inside the triangle: The logo of the famous Soviet LZOS factory for lenses and optics.