hello the 10 Kon 1957 has a common variety and one rare but I don't know the difference. could you please help me to know if this coin is common or are variety? Thank you
AFAICT it's the most common variety, but the difference between the most common and the second most common variety is so minuscule that I couldn't tell for sure from those photos; I'd need a much more detailed close-up of the bottom part of the globe.
It's definitely not any of the two rarer varieties. I'm not sure what the "one rare" variety is that your source (presumably) mentions; there are several options.
Incidentally, it's a 10 kopecks, not a "10 kon"; Π is the Cyrillic version of the letter P.
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