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In 1943, due to the shortage of copper during World War II, the U.S. Mint produced steel cents instead of the traditional copper ones. However, steel is prone to rusting, so the coins were coated with a thin layer of zinc to prevent corrosion. This zinc coating gave the steel cents their silver appearance. Therefore, the correct answer is zinc.

The rarest Mercury dime is the 1916-D. This coin was minted in Denver and has a low mintage of only 264,000. Additionally, it is highly sought after by collectors due to its historical significance as the first year of issue for the Mercury dime series. The combination of its low mintage and desirability among collectors makes the 1916-D Mercury dime the rarest among the options given.

During the years 1965-1967, all U.S. coins were made without mint marks. Mint marks are small letters or symbols on coins that indicate which mint facility produced them. However, during this period, the U.S. Mint temporarily halted the use of mint marks due to a shortage of coinage dies. This means that all coins produced during these years, regardless of the mint facility, did not have any mint marks.

The Kennedy half dollar has come in three different metallic compositions. The first composition was 90% silver and 10% copper, used from 1964 to 1970. The second composition was 40% silver and 60% copper, used from 1971 to 1974. The current composition is 91.67% copper and 8.33% nickel, which has been used since 1971. Therefore, there have been three different metallic compositions for the Kennedy half dollar.

In 1967, the fish depicted on Canada's 10-cent piece was a mackerel.

The first year of the Lincoln cent with a "D" mint mark is 1911. This indicates that the coin was minted in Denver, Colorado. The Lincoln cent was first introduced in 1909 to commemorate the 100th anniversary of Abraham Lincoln's birth. However, the "D" mint mark was not added until 1911, making that the correct answer.

The correct answer is 1955 because it was the last year that circulating silver coins were made with an "S" mint mark. After 1955, the United States Mint stopped using silver in the production of circulating coins, and the "S" mint mark was no longer used for silver coins.

The reverse of the Sacagawea dollar features an image of an American bald eagle, which is surrounded by 17 stars.

The given answer, 2001, is incorrect. Canada never produced a 3 cent piece. The correct answer is that Canada never had a 3 cent piece.