Here is the coin from my collection. This is a rare gold award coin called zolotoy of the weight of 1\4 of chervonetz. These coins were the first Russian coins bearing the date in arabic figures (1654). They were minted in 1654 as the payment or award to the army of Kozaks of Bogdan Hmelnitsky. Many of them were holed and used as distinction mark on a hat or a coat. I checked with numismatic section in the Russian Historical museum about authenticity of the coin (it is 100% authentic) - this is so called middle-wear die. First coins of the series were minted with fresh crisp letters (figure '5' was looking more or less like modern '5') and the last coins had barely distinguishible devices (figure '5' was more like modern '1'). Interesting piece of history.<br>
<img src="http://forum-su.com/files2/alexmih_179.jpg" border="0" alt="gold 0.83gr" />
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This is Russian language article about such pieces by Spassky (for those who want to dig further, sorry for Russian I do not know if it was ever translated).<br><br>
<img src="http://forum-su.com/files2/hmel1_496.gif" border="0" alt="spassky article" />