QUOTE(Maya @ Jul 11 2007, 10:00 AM) [snapback]334426[/snapback]
That is a beautiful coin.
But why would anyone deliberately mark it in black ink (figure 8 on the reverse)? Wouldn't that affect the value?

It was probably done a long time ago. Some prominent Russian collectors even had their own countermarks, or "brands", that they actually embossed on coins to designate their ownership (read about this in Uzdenikov, 2nd edition, page 659). Although there were a few important collections which might impart added value to a coin with such a stamp, it is obviously a pratice which is highly discouraged today (for the very reason you mention).
This particular auction also offered a 1877 poltina with some Japanese (???) character(s) written in red ink on it ... it was part of lot 499. The catalog says it was 1876 with red ink, but it was actually 1877 (and there was also an 1876 poltina in lot 499 WITHOUT red ink, but condition only VF or so ... there was a better 1876 poltina sold individually as a separate lot in that auction).