1964s Lincoln Cent

I have read in all publications on this subject that the Lincoln cent minted in SF had no mint mark. However, I got one with a weak "S" under the date.
Was it indeed in circulation ?

 

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PICTURES!

 

Your forgot one option in your poll.

"This thread is worthless without photos!"

 

I have no doubt that if the OP is seeing an "S", that s/he will have to point it out to the forums its location and that 99% of the members will say "What S?"