By Susan Headley, About.com:Coins

The U.S. Mint offers a bewildering variety of coin sets each year, ranging from the old stand-by’s such as Proof sets and Uncirculated (year) sets, to the special commemorative sets and coins that have limited mintages. Learn which ones typically skyrocket in value right away, and which ones are usually the duds.

A. The answer, in a nutshell, is the limited mintage sets that have a unique coin in them that cannot be gotten in any other way are the sets that make the smartest buys. For example, the Twentieth Anniversary Silver Eagle 3-Coin Set that came out in late 2006 had a coin that could only be acquired as part of the set - the Reverse Proof Silver Eagle. This set had a mintage of 250,000 maximum sets, and the Reverse Proof immediately doubled the set’s value. As of January 2008, the set sells for around $400 in PR-68 (a low-end grade for the set.) The issue price was only $100. Read Full Article