QUOTE(gxseries @ May 8 2006, 02:17 AM)
I'm hoping that grivna will pop around to determine it's authenticity.
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Well, I don't think it is possible to positively determine that a coin is genuine just from looking at a scan (although you can sometimes identify a fake from a scan). And I'm not sure I have sufficient knowledge to claim status as an "expert" in counterfeit detection. If I did, I'm sure I'd have some humbling experience that would remind me of how much I have to learn.
gx is correct, it is a poltina (half ruble) of 1726 (St. Petersburg mint) with a retrograde "6" in the date. Like many other countries' issues, the half-crown size coins are often much rarer than the crowns (though less avidly collected).
The placement of the legend relative to the eagle does not disturb me. It does vary from the illustrations in Uzdenikov's book, however the dies were often made by hand in that era, so there are many, many different varieties.
The most striking feature of the coin shown is the retrograde "6" in the date. I looked through GM but was unable to locate such a variety among the coins listed there. However, Severin does list the retrograde 6 coin in his 1963 catalog ("The Silver Coinage of Imperial Russia 1682 to 1917") as Sev-800 (rated as "scarce" there).
I see nothing about this coin that causes me to believe that it is an obvious fake. However, no-one who knows anything would ever declare a coin genuine based solely on a scan.
The clip on the edge might well affect market value, especially if it was done outside the mint. As for what the coin might bring at auction, it is hard to say, but I think a few hundred dollars is quite possible.
Russian coins of this era are often crudely made with flawed flans and poorly struck. They are rarely seen in uncirculated. So you can't collect these in the same way that you might collect some other coins.