Glossary of Terms
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

A mintmark used to indicate coins struck at the New Orleans, Louisiana, branch mint.

Obsolete Note

A note issued by a bank, railroad, canal, etc., typically of the early 19th century, which later became obsolete, although the issuer may not have become insolvent (as contrasted with broken bank notes, from insolvent institutions).

Obverse

The front or face side of a coin, generally the side with the date and the principal design.

Oct

A shortened term for octagonal, which refers to the Pan-Pac octagonal commemorative $50 coin.

Off Center

A coin struck on a blank which was not properly centered over the lower die.

OGH

An abbreviation for "Old Green Holder" which includes all generations of PCGS holders with a light green insert rather than a blue insert.

OH

An abbreviation for "Old Holder."

O-Mint

An slang term for coins struck at the New Orleans, Louisiana, branch mint.

Open Collar

A device used for striking early U.S. coins whose edges had already been stamped with lettering or reeding. This device restrains and positions a planchet above the lower die.

Opening Bid

The starting price of a lot during a live auction, determined by the presale bidding on that specific lot.

Orange-Peel Surfaces

So named because of its resemblance to the skin of an orange, the dimple-textured fields seen on many Proof gold coins. Some Mint State gold dollars and $3 gold coins display this effect to some degree.

Original

A term used to describe any aspect of a coin that retains its original state, and has not been dipped, cleaned, or altered in any way.

Original Roll

Coins wrapped in paper and stored at the time of their issuance. All the coins in the original roll have the same date, denomination, and mintmark and generally will have similar toning and luster.

Original Toning

A term used to describe the color naturally acquired by a coin that has never been cleaned or dipped. Original toning ranges in color from light-pale yellow to extremely dark blues, grays, browns, and even black.

Over Dipped

The term for a coin whose luster has been stripped or dulled by 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.

Overgraded

A coin bearing a grading designation higher than it should.

Over-Mintmark

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

Overstrike; Overstruck Coin

A coin struck over another previously struck coin, sometimes of a different variety or type, instead of on a blank planchet.

Oxidation

The formation of oxides or tarnish on the surface of a coin from exposure to air, dampness, industrial fumes, or other elements.

​​