Vintage lens Industar - 23U.
Made in the USSR in the 1960s.
Released at the Lytkarino Optical Glass Plant.
Industar 23U 4.5 / 110 is a lens for a medium
format enlarger with a 6x9 cm frame format.

-Type: Fixed focal length
-Focus: Manual Focus
-System: M39
-Optical design: Tessar
-Focal Length 110 mm
-Aperture ƒ / 4.5
-Angular field 53 °
-Resolution 50/13 lines / mm

Vintage working condition.
Status in the photo.