harpua, if you bought it at the auction is likely to be absent defects. At one time I was in Russia and to take these coins in shops when shopping. I was able to collect about eight hundred! Now a pair of kilograms of rubbish!)))
january1may, it Leningrad Mint. I have a little coins Moscow Mint.
Buddy,there are other interesting points. Gradual destruction.
I tried to reproduce. I have to take ordinary copper coin and sulfuric ointment, which is bought in a pharmacy. I sealed half of the coin for comparison. Apply the ointment and rubbed his fingers. Coin became black after 20 seconds. I rubbed the coin tough suede and got the result. I did it quickly and inaccurately. Just experiment.
Maybe I can not really be expressed. Unfortunately, I do not speak english and I use Google translator. A sense replaced and not always translated correctly. Excuse me!))).
Yes you are right. The last official recoinage in Tsarist Russia - the end of XVIII - the beginning XIX century. P.S. there is information about recoinage in Soviet Russia in the XX century.
2 kopecks 1930 USSR. "2 stars". Very rare defect. This is not a double blow. Presumably - a defect in the manufacture of the working stamp. I know of only 4 mention of such a coin. In the photo - the best example.
Hello! I am from Belarus. I am not a passionate collector, but I have a lot of coins from different countries. Also, I'm interested in coin defect. I am the author of a small project "***" of Belarus(I will not do my ads!). The goal of the project - to make a memorable token for each city in my country. I've done already 5 limited editions. All I want to do 120 releases! Later, I'll tell you about it. In my country there was a denomination. New coupons and coins are released into circulation. I can help with their acquisition and to answer any questions about my country.