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Please check your coin again and post a new, separate question. The San Francisco Mint was inactive from 1956 to 1964 inclusive, so there are no 1957-S coins of any denomination.

If your coin has a mint mark it would be "D", for Denver. 1956 and 1957 cents were subject to a lot of problems with clogged and broken dies so you may be seeing a mangled "D" beneath the date.

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12y ago

What else can I help you with?