Thin. Planchets or struck pieces of less than prescribed thickness, due to an incorrect gauge of rolled stock from which the blanks were formed. While thin struck coins are anomalies, there are two reasons for this error: a rolling mill that rolled the strip to an incorrect gauge, or incorrect blanking of a thickness strip intended for a thinner coin. Since automatic gauges monitor thickness on modern rolling mills, it is less likely for this error to occur. It is more likely a human error of a workman feeding a thickness strip for a thinner coin into a blanking press instead of a proper thickness strip. See thickness.