Keeping up with the Terms, Abbreviations and Jargon can be sometimes frightening.

We hope that the following Coin Collecting Glossary on the most frequently used terms, acronyms, and definitions will be beneficial to you.

Coin Term Glossary

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

O

Mintmark used to signify coins struck at the New Orleans, Louisiana branch Mint.

Obsolete

A coin design or type that is no longer produced.

O-Mint

A term used for the coinage of the branch Mint in New Orleans, Louisiana.

Obverse

The side of the coin that generally shows the Coat of Arms, President’s or Monarch’s bust. The obverse side is referred to as heads and is the front of the coin. Generally the date side.

Oct

Short for octagonal

Off center

A coin struck on a blank that was not properly centred over the anvil, or lower, die. Coins that are 5%, or less, off-centre are graded by PCGS as a regular coin. Those struck off centre more than 5% are graded as error coins.

Orange-peel Surfaces

The dimple-textured fields seen on many Proof gold coins; their surfaces resemble those of an orange, hence the descriptive term.

Ore

A naturally material from which metals are extracted by means of mining practices.

Original

A term used to describe a coin that never has been dipped or cleaned.

Original Rolls

Coins in fixed quantities wrapped in paper and stored at the time of their issuance. Silver and gold coins stored in these rolls often have peripheral toning and untoned centres. The coins stored in rolls suffered fewer marks than those in coin bags.

Original toning

A term for the colour acquired naturally by a coin that never has never been cleaned or dipped. Original toning ranges from the palest yellow to extremely dark blues, greys, browns, and finally black.

Over -mintmark

A coin struck with a die on which one mintmark is engraved over a different mintmark.

Over Dipped

A coin that has become dull from too many baths in a dipping solution

Overdate

A coin struck from a die with a date that has one year punched over a different year. Sometimes an effort is made to polish away evidence of the previous date. PCGS requires the overdate to be visible to be recognized.

 Oz

Ounce. Precious metals use Troy Ounces that are slightly more than a normal Ounce.

If we missed a word or phrase, please let us know. We would like to grow and expand this list with your help.

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