1. Error:
A coin created improperly during its initial production, unintentionally missed during quality checks, and subsequently put into circulation at a later time.
2. Face Value:
The face value of a coin is the amount of money it is legally acknowledged to be worth. One can use coins for this value in transactions or exchanges. For instance, a dime has a face value of 10 cents. In contrast, its value to collectors varies depending on the type of metal it is composed of.
3. Field:
Field refers to the space on a coin's surface that isn't adorned with any motif or writing. It's like the blank canvas of the coin without decoration or words.
4. Grade:
The grade is a way to show how much a coin has been used and become worn out from being in circulation. Basically, it’s a score that tells us how much the coin has been used in everyday transactions.
5. Hairlines:
Hairlines are tiny traces or insignificant scratches on coins that appear after cleaning or polishing them.
6. Incuse:
Imagine a coin's design being pushed and pressed into the surface instead of popping out. This pressed-in part is the incuse, opposite the raised design we usually see on coins.
7. Ingot:
An ingot is a chunk of molten metal poured into a customized mold to form a particular shape. These shaped metal pieces are widely used to make coins and minted bars.
8. Inscription:
The unique words imprinted onto a coin, medal, or bar give it a distinct message or meaning and make it more genuine.
9. Intrinsic Value:
Intrinsic value is the present worth in the market of the valuable metal in a coin.
10. Key Date:
A rare date needed to finish a collection, often more challenging to locate and afford.
11. Legal tender:
Legal tender refers to the official currency issued by a government, including coins, dollar bills, or other forms of money accepted as valid payments for goods and services within a country's borders. It's similar to the government-approved special money that everyone may use in ordinary transactions.