Weak mint mark on 1968 s penny

Looks like the bottom of the mint mark was not struck well

 

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The weakness of the "S" could be from the dies being cleaned. My fist guess would be that the die had some dirt and/or grease stuck in it.

 

TILTED MINTMARK.


Key is that intentional Die abrasion usually fades to one side not even fading like the example in the image. Plus I see no mint die polish marks.
Reed.
P.s. above information quoted from http://www.error-ref.com/

 

So does this error add to the value? I have a roll of 1968-s pennies and about 30% of them have this error.