It seems to me that this is a plagiarism of the Czech Logarithmic line Logarex. This slide rule has 3 features. The item is brand new. It is labeled "State quality mark of the USSR".
Has a "discounted" ink stamp. (the era of electronic calculators has begun). The item "1979 new vintage Soviet Russian Slide Rule USSR Logarex" is in sale since Friday, November 15, 2019.This item is in the category "Collectibles\Science & Medicine (1930-Now)\Engineering\Slide Rules". The seller is "viktor2366" and is located in Odessa, default. This item can be shipped worldwide.