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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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Mint error: Spectacular 1794 Doublestrike!
Stefan Proynov: Spectacular 1794 Doublestrike! There are no rarity ratings available for error half cents, but this coin is certainly rare! A normally...
Gold Sovereign NGC Mint Error
1863 Great Britain Gold Sovereign NGC Mint Error MS 66
Stefan Proynov: For your attention, a spectacular mint error of a British sovereign; it’s hit...
fake error coins. Error expert – is this a mistake?
Fake error oins of bulgaria..My name is Stefan Proynov and I study forgeries in numismatics.
In addition to making in-depth analyzes, we publish each discovery.
In...
