All I can see is a potential die chip in the MM. It's definitely not a D/S. beginning in 1990 Mint mark's are added to the dies & not hand punched thus eliminating that type of error RPM.It's worth 5 cents
Also the mint in Denver was creating there own dies then, co it wouldn't have a different mint mark. TheSan Francisco mint were only making proof coins then. So no transfer of dies from mint to mint were happening any longer. Just our brains trying to make sense of what we are seeing.
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