Late-stage capped die strikes are worth less than early-stage. An early-stage capped die strike might show a brockage, a counterbrockage, a...
The top coin looks like a strike-through error. The bottom coin is a "lucky token" cent (encased cent). It is not an error.
The obverse was struck through a very late-stage die cap. The edge shows a partial collar error.
Damaged outside the mint.
As best as I can tell from the photo, it looks like an authentic cracked planchet error to me.
It's a lamination crack. The metal is cracking and peeling due to impurities in the alloy. This is extremely common.
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...
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