A missing clad layer is a coin that has one of its two outer clad layers missing from its copper core. As a result the coin with a missing clad layer will show the copper core on one side and the regular outer layer on the other side. The weight of a mint error with a missing clad layer is less than a normally struck coin.

This major mint error was just discovered! A missing clad layer on the 1776-2026 President Trump dollar. A normally struck Trump dollar has a weight of 8.1 grams. This Trump dollar missing clad layer has a weight of 6.1 grams since its missing the obverse clad layer.