Photo gallery showing John Adams Presidential Dollars that got two sets of edge lettering inscriptions on them.

Beginning in 2010, the United States will begin issuing a new reverse design for the one cent coin, commonly called the penny. See what this new penny looks like and learn what the design means.

People who are about to attend their first coin show often feel a little intimidated. With fancy words like "bourse" (to describe the trading floor) and lots of money changing hands for, well, money, it can be a bit intimidating to the new coin collector attending his first show. Find out all about the do’s and don’ts of coin show etiquette.

The new penny design for 2009, second design.

The new penny design for 2009, first design.

Learn how to tell if your two headed coin is genuine or fake. This page explains how two-headed coins are made, and how to tell if your 2 headed coin is real or not.

If you have found a two-headed coin and want to find out how much your two-headed coin is worth, or if your coin has two tails, this article will explain what these coins are worth, and how coins with two heads are made.

This is an image-based tutorial teaching you how to explain your coins to another collector using the proper terminology. The U.S. cent coin, the proof Statehood quarter obverse, and the reeded edges of circulated quarters are used as examples.

Mechanical doubling, sometimes called machine doubling or strike doubling, is defined on this coin terms glossary page.

People often ask if the U.S. Mint is making errors on the coins on purpose, in order to entice people into removing them from circulation and collecting them. Find out the answer to this question about mint error coins.