1974 s proof?

Are all 74 s proofs? Why does the S look weird

 

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no, not all were proofs.

 

So its not worth saving

 

1974 was the last year SF produced business strikes (aside from a few SBAs and some recent quarters).

 

To answer your question about the "S", it is San Fransisco mint mark style MMS-009 (Blob S). Here is a link to the different San Fran mint mark styles:

http://www.lincolncentresource.com/San_Fransisco_Mintmark_Styles.html