QUOTE(bobh @ Apr 25 2006, 05:56 PM)
Thanks for these scans for everyone to see. It really helps!
(1) The large crown is positioned too high and the small crowns are too small in the auction pictures;
(2) The tip of the sceptre on the left in the reverse, which is held by the eagle, ends at a different place relative to the "soft sign" (Cyrillic letter "ь", or "мягкий знак");
(3) The dot is too far away from the "A" in the auction pictures;
(4) The globe seems too high in the auction pictures, and the wing tips of the eagle look different on that side, too.
(5) The shape of some of the letters on the obverse legend is different -- e.g., the next to last letter ("A") in "ВСЕРОСИСКАЯ" is wider in the auction coin than in the other pictures;
(6) Anna seems to be gazing upwards into a higher place in the auction coin than in the other pictures, where she seems to be gazing straight ahead approx. to the dot right before "ВСЕРОСИСКАЯ";
(7) There are subtle differences in the drapery on Anna's dress which don't seem to be attributable to wear, e.g. the crease on the shoulder starting at the far left (from the viewer's standpoint) is missing in the auction picture.
Is that enough?

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The differences you describe are present, but could be variants resulting from the use of manual, rather than mechanical, engraving of dies. In this period, there are so many variants that the challenge is to find 2 coins from the same set of dies.
Certainly there are counterfeits of Russian coins and the skill of coin forgers has increased in recent years (especially in ancient coins) to the point that they are becoming very difficult to detect. The fake of the Nicholas II gold coin (with the wrong edge legend) that was posted here recently is a case in point.
This coin might be bad, as you suggest. However, if it is a counterfeit, the forger is much more talented in his production than most of what shows up on ebay (which some collectors now call "efake").