What is the mistake on the 1999 penny?

The primary mistake found on some 1999 pennies is the "Close AM" variety, where the letters "A" and "M" in "AMERICA" on the reverse side are touching or are exceptionally close together.

Understanding the 1999 "Close AM" Penny Error

This specific error makes certain 1999 Lincoln cents highly sought after by collectors. The "Close AM" variety is a notable example of a mint error that slipped into general circulation.

What Caused the Error?

The "Close AM" mistake occurred because mint workers accidentally used proof dies to strike coins meant for general circulation. Proof dies are typically designed with slightly different spacing and features, intended for highly detailed, specially struck collector coins (proof coins), not for the high-speed production of circulating coinage. Only a limited number of these coins were struck before the error was identified and rectified, making the "Close AM" variety relatively rare compared to standard 1999 pennies.

Identifying the "Close AM" Variety

To determine if you have a valuable "Close AM" 1999 penny, you'll need to carefully inspect the reverse side of the coin:

• Locate "AMERICA": Turn the penny over to the side with the Lincoln Memorial. Find the word "AMERICA" at the top of the design.
• Examine the "AM": Focus on the letters "A" and "M" in "AMERICA."
• Look for Proximity: On the "Close AM" error, the bottom serifs (the small, decorative lines at the ends of the strokes) of the "A" and "M" will be touching or appear to be almost fused together.
• Compare to a Standard Penny: On a standard 1999 penny, there will be a clear and distinct separation between the bottom of the "A" and the "M."

Here's a quick comparison:

Significance to Collectors

Due to the limited mintage of pennies struck with these incorrect proof dies, the 1999 "Close AM" variety has become a valuable collectible. Its rarity and the unique story behind its creation make it a desirable piece for numismatists.