|COIN COLLECTING DEFINITIONS STARTING WITH "O"|
obverse: the front of a coin, usually the side with the date or head. When you flip a coin and call “Heads,” this is the side you want.
off-center: a coin that was not perfectly centered when it was struck. Off-center strikes can range from minor to extreme.
original: a coin that has never been cleaned or impaired in any way.
original roll: a roll of coins that remains as fresh as the day the coins were first placed together.
original toning: natural color on a coin, as opposed to artificial toning.
over-mintmark: a coin with two mintmarks, one on top of the other.
over-dipped: a coin that has received one too many chemical baths in a mis-guided cleaning attempt. In other words, someone blew it!
overdate: a coin with two dates (or parts of dates), one on top of the other.
over-grading: the deliberate or unintentional grading of a coin above its true grade. This practice is sometimes used to sell coins for more than they are worth.
oxidation: tarnish or corrosion on a coin caused by chemical reaction with its surroundings. Some tarnish is okay, any corrosion is bad.
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