Two different types of nickels were minted in 1942.
During the early part of that year the coins were made out of the familiar cupronickel alloy that's used today. These coins were made at Philadelphia (no mint mark) and Denver, which used a small "D" to the right of Monticello.
In mid-year the Mint changed the coin's composition in order to save nickel metal for the war effort. The new coins looked similar, but were made of an alloy of copper, silver, and manganese. To distinguish them from their cupronickel predecessors, the Mint used large mint marks located above the dome of Monticello. These coins were struck at San Francisco and Philadelphia. For the first time, Philadelphia coins carried a P mint mark.
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The mint mark positions for Jefferson nickels are:1938-late 1942 and 1946 to 1964: to the right of Monticello on the backLate 1942 to 1945: above the dome of Monticello1965 to 1967: No mint marks were used on any US coins regardless of where they were made1968 to 2004: to the right of the tail of Jefferson's wig2005: Below the word Liberty2006-present: Below the datePossible mint marks are:"P" or no mint mark = Philadelphia"D" = Denver"S" = San Francisco
On the back, to the right of the base of the building. No mint mark = Philadelphia D = Denver S = San Francisco
Half dollars in 1942 were produced at 3 US Mint facilities; Philadelphia, Pennsylvania {uses no mint mark}, Denver, Colorado {uses the letter "D" as a mint mark, San Francisco, California {uses the letter "S" as a mint mark.
The mint mark position is to the right of Monticello. No mint mark = Philadelphia D = Denver S = San Francisco Please see the Related Question for more information.
The mint mark position is to the right of Monticello.No mint mark = PhiladelphiaD = DenverS = San FranciscoSpecial wartime nickels had the mint mark above the dome of Monticello. The position was moved again in 1968, near the date. In 1980 Philadelphia began using a P mint mark.