1968 S Lincoln Proof Penny - S Mint Mark filled in?

Hi guys,

I have this 1968 S Lincoln Proof Penny and would like to know what is going on with the S mint mark. Are these die chips in between the curves of the "S" which make the "S" look filled in? Is this common on a 1968 S Lincoln Proof Penny?

 

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It could be a rpm

 

Nope. Those are Die Chips. IMHO

 

You're correct. Die Chips (Internal Die Break). It's not an RPM. Not sure if it's common on proofs, but I don't believe it adds anything to the value.

 

Cannot find any info on RPM for this date, so probably chips? IDK

 

Chips

 

I thought die chips were mostly common on 1950's pennies not late 60's pennies??

 

Incorrect. Die Chips can occur on Mint Marks for any year.