Whitman Expo
obligation
Information given in the lettered inscriptions on the back of a note, describing its exchangeability. As an example, certain early Legal Tender Notes have this inscription: “This note is a legal tender for all debts, public and private, except duties on imports and interest on the public debt, and is receivable in payment of all loans made to the United States.” Also called Legal Tender Status. See More
obsidional coins
Emergency coins struck during battle, also called siege pieces. See More
obverse
The front or face side of a coin, generally the side with the date and principal design. See More
OGP
Original government packaging. See More
overdate
A date created by superimposing one or more numerals on a previously dated die. See More
overgraded
A coin in poorer condition than stated. See More
overstrike
An impression made with new dies on a previously struck coin. See More
overvalued
A coin whose legal-tender exchange value has been set at a rate higher than its face or intrinsic value in an effort to discourage its export. See More
oxidation
The formation of unsightly discolored spots of areas on a coin as a result of exposure to humidity, air pollutants, or other environmental factors. See More