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Stefan Proynov: Denver mistake for a million dollars!
Stefan Proynov: We will call this coin the Denver Million Dollar Error because the coin is extremely rare minted with a wheat grade on...
Stefan Proynov:No Date 5C With Cents, Liberty Nickel — Struck 45% Off Center
No Date 5C With Cents, Liberty Nickel — Struck 45% Off Center — AU55 NGC.
Stefan Proynov Mint Error coins consultant for Europe
My estimated price...
Stefan Proynov: Struck 20% Off Center — VF35
(1865-1889) 3CN Three Cent Nickel — Struck 20% Off Center — VF35 NGC.
Stefan Proynov Mint Error coins consultant for Europe
My estimated price for this...
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Mind-Boggling MS66 Error!
Mind-Boggling MS66 Error! Early error coins are scarce in general, but this coin is incredible. This piece ranks among the most amazing half cents...
Mint error Nikel 2015 PCGS
An expert on wrong coins in Europe, Stefan Proynov, claims that more and more wrong coins are finding their place on the market.
Here is...
Stefan Proynov: A unique wrong coin
Stefan Proynov: Erroneous coins gain more and more numismatic value, and the bigger the mistakes, the higher their price.
The truth is that each errant...
