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The San Francisco mint opened in 1854 and produced coins almost every year to the present except for a short time from 1955 to 1967. The facility at West Point began striking Lincoln Cents in 1974 and continued until 1986, but no mint mark was place on any of the coins. In 1983 the "W" mint mark appeared on gold commemorative coins. In 1986 American Gold Eagle coin were produced but did not bear a mint mark. Today the "W" mint mark appears on all gold commemorative coins and a few silver coins as well.

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Q: What years were the S mint mark and what years were W mint marks?
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