After laying into Mike Spinetti for inaccuracies in his description/history, I would think that you would be doubly sure that your description was 100% accurate.

I'm sure I'm wrong, but ---

You said:
"James Campaglia's U.S. Price Guide Rate the rarity of this chip at R-10 - the rarest grade in his book."

Isn't Unique the rarest grade in his book?

You said:
"The chip is 16 years old."

TCR mentions 1978 (26 years). Campigilia doesn't mention a date. Where did you find 1988?

You said:
"100% of the cross-hatching is intact. Not even the smallest ding, nick or scratch is present."

Again, I may very well be wrong but it appears that there are a couple of dings at 1:30 and missing cross-hatching at 9:00. I assume that the reverse is not better than the obverse. Your scan is below.

Although everything I mentioned is minor, it does show that no one is perfect. We all make mistakes.