Hello,
We can identify at least 4 different Cyrillic and Latin Kiev rangefinder front plates between 1950 until the end of production.
Around 1950 to 1954-55 :
Uncommon, made using engraving. Can be found without the latin name.
From 1955 to 1957-58 :
To me the finest sample
From 1957 to 1974 :
From 1974 to the end of production :
Please post your samples if you own something different.
Best,
Jed

