The second strike was on top of another planchet. It's known as an off-center, uniface strike. These are less desirable than off-center strikes...
It would depend on a comparison of other Bulgarian coins from the same year. If your coin has one face rotated in direction opposite to that of...
The dense pattern of scratches on both faces indicates alteration after the strike.
It's definitely not a mint error. I would surmise that the obverse was ground off and a copper basin was attached, perhaps for later insertion of...
Quite true. There are 1965 quarters struck on 90% silver planchets and 1964 quarters struck on Cu-Ni clad planchets. These "transitional errors"...
The first thing you need to do is get a precise weight. A silver quarter weighs 6.2 grams while a clad quarter weighs 5.67 grams.
What you have is something completely different. It is progressive, indirect design transfer -- a form of die deterioration. A vague image of...
This appears to be post-strike mint damage. Coins can get horribly damaged inside the Mint between striking and bagging. Unfortunately,...
It's not an error. This type of alteration is known variously as a "squeeze job", "vise job", or "hammer job". A dime was hammered or pressed...
The reverse was struck through "grease". This term is actually a misnomer since a variety of substances is responsible for these effect. In any...
Broadstrike with a straight clip. When struck out-of-collar, the straight edge bows out as the coin expands.
I'm unfamiliar with "high rim" cents from the 1950's. I know some cents from 1990 and 1991 (and occasionally other years) appear to have...
Any time. Loose lucky token cents are most commonly found in the 1950's. Must've been a popular thing to do back then.
This an "encased cent". These are also known as "lucky token" cents. It was once confined in an outer ring (often aluminum) bearing some...
Generally, rotated die errors are measured in degrees of deviation from perfect coin rotation. By convention, reverse rotation is measured...
Rotated die errors are just that -- errors. Both the anvil die and the hammer die are subject to such errors. A rotated die results from at...
Yes, this is what happened. As far as value goes, an uncirculated example should be worth around $125. Yours appears to have experienced...
This quarter was struck through a detached clad layer. A desirable error.
Invasive tests are not for everyone. But I've found them useful over the years to detect anomalous compositions and reject claims of nonstandard...
Color is a very unreliable diagnostic. Given the right chemical environment, you can turn a cent almost any color imaginable. If weight and...
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