ANTIQUE OPTICIANS OPTOMETRIST OPTOMETERS? TURRET DEVICES GLASSES SPECTACLES

Hinges working. Shows wear. There are no glass elements inside the small round openings at the turret of the copper part. The black one has and is missing 2 elements. Both turrets moves smooth. Shows some scuffing and small scratches. Nice patina.
Size is 85x47mm and total unfolded length is 139mm.
Smaller black part size is 48x32mm and total length is 92mm
Come in original case.