1964 S over D mm?

I think I see a S over D (or vice-versa). However all my searches end up nowhere. I am able to zoom my own pics making it much easier to see mint mark. Can anyone else see it or have any info they could share? Many thanks!

 

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You need to provide a better close-up of the mint mark, but my gut reaction is that the "D" is just smashed a bit or it's a die chip.

Chris

 

that's a filled mint mark, not an S. The San Francisco Mint was not making coins from 1956-1968 and although the Assay Office there may have struck a few coins, none of them bore an "S" mintmark

 

I cropped the same pic hoping it will help a little. I will have to get a better pic tomorrow. thanks for the quick reply.

 

Looks like a mintmark that took a hit. Ot seeing evidence of either an RPM or OMM.
Keep up the hunt!