1921 (S) Lincoln Wheat Cent Improper Alloy Mix

Description

This 1921-S Lincoln Wheat cent exhibits an improper alloy mix, commonly referred to as a "woody" cent. The distinctive wood grain-like striations visible across the coin's surface are caused by improper mixing of the bronze alloy (95% copper, 5% tin and zinc) during the planchet preparation process. When the metals are not thoroughly blended before the planchet strip is rolled, the different metals create visible banding or streaking patterns that resemble wood grain. In this case, the graining runs Northwest to Southeast on the obverse and Southwest to Northeast on the reverse. The term "woody" was coined by collectors to describe this distinctive appearance. While improper alloy mix errors can occur on any copper or bronze denomination, they are most commonly encountered on Lincoln cents and are particularly visible on coins from the San Francisco Mint during the early 1920s.