Help With Thaler Type Coin

I've heard of these, but never actually seen a real one. It's a Russian counterstamped thaler, known as a "yefimok", worth 64 kopeks local currency. Coins from all over Europe were counterstamped. The undertype of yours appears to be from Dortmund, Germany.

I'm nowhere near expert enough to be able to give an opinion on the authenticity of either the counterstamp or the host coin, but thalers from Dortmund are generally extremely rare; a Russian counterstamp on one would probably be even rarer.

There's something funny going on here. The date on the undertype shouldn't be "1660", because the counterstamping happened in 1655 - as you can read in the top counterstamp, which says "1655". Post-dated undertypes are rare; most yefimoks have undertype dates pre-1653. The obverse portrait is of Holy Roman Emperor Leopold I, who reigned from 1657 - his coins shouldn't have been turned into yefimoks at all.

In short, I'd be skeptical about it's authenticity if I saw it for sale on ebay.

That's what I needed to confirm - the date of the host is off. Also, is it me, or does the host appear to be overstruck something else (there's lettering bleeding-through on the portrait side).

The counterstamp is Russian yefimok, like Sap said, from the reign of Alexei Michailovitch (1645-1676).

I'm un-sure of the authenticity, however.

Thanks alot! The date on coin was 1660, but guy, who sold me this coin changed it. ((((( Cos he knows there was no counterstamps after 1655. But it is still a question, could it be real coin? This coin is heavy (sorry) and looks overstuck... So any reason spend time to do false for 100 dollars?
(sorry for my English)

My apologies to the non-Russian-speaking folks. What I said was that a lot of modern Chinese fakes are sold as low as a dollar a pop, so $100 bucks on a single coin could be very desirable for a counterfeiter and shoud not be used to rule out the possibility that this coin is not authentic.

I also remember a story Bob told a while ago, about someone in the U.S. counterfeiting quarters...