No: 232463

Above the serial# there is stamped "86" (Year of Production?)

Tech­noin­torg, also known as Tento or Vnesh­tor­giz­dat (Soviet Ministry of Foreign Trade), was the Moscow-based ex­port or­gan­i­sa­tion of the Sovjet Union.They mainly dealt with optics manufactured by ZOMZ (located at Sergiev Posad, in Soviet times called Zagorsk). ZOMZ sells now under their own name Kronos.