Thanks to Thomas Arnold
The 1943-S Lincoln Cent represents the San Francisco version of the zinc-coated steel Cents issued by the U.S. government as a replacement for the bronze versions used up until that date. Demand for copper escalated in World War II because of its use in weapons and assorted other items necessary to prosecute the war effectively. Over 100 million 1943-S Steel Cents were struck, making them very common today. Apparently, collectors saved many thousands of Mint State examples, as evidenced by the large number of certified examples in the MS66 and MS67 grades. In MS68, this date is scarce, but not rare, and collectors have ample opportunities to obtain an example in this grade, something that is not possible with other dates in the series.
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