Can a MS 70 or PF 70 Coin Have Any Imperfections?

What is a 70? According to the NGC website,"NGC defines a Mint State or Proof 70 coin as having no post-production imperfections at 5x magnification." Does this mean a coin that that has pre-production imperfections rate a 70? What about an incomplete strike, like missing some of the points on a star? Can this be a 70 coin too?

I've seen many NGC PF 70 coins that under 5x magnificant will have a very minor pit or flaw in the field. I assume these could be part of the original blank and are in fact pre-production issues, but this gets back to the question of what is a 70. I've also seen coins with imcomplete stars (missing 4 out of 5 points) that rate a 70. I have returned a PF 70 UC Silver Kennedy Half Dollar for a review, it had a litteral hole in the reverse, and the coin was bought back by NGC. Which was all fine, but it still makes we wonder what really is a 70?

As a example see the attached image. According to NGC this is a 1981 PF 70 UC Susan B. Anthony dollar. Note the imcomplete star (missing 4 out of 5 point) near the "S" mint mark. Is this a 70 coin or another coin that needs review by NGC?

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