Even though the link I provided relates to PCGS grading it does give you an idea of the separation of grades. Surface, strike, luster obviously all come into play. If surfaces and strike are similar, outstanding luster and eye appeal can carry the coin to the next grade. Then again the coin you reference if submitted ten times it could comeback say four times as a 65 & 66 with a couple of 64's thrown in. Thus is the grading game. A 67 is out of the question IMO. NGC has graded quite a few modern Peruvian gold coins and 28 1965 Sol at the 67 level or higher so they do have that going for them.
Judging that level of grading is tough with pictures of a slabbed coin. The difference in the two grades is often something that requires magnification. I feel it is difficult to differnetiate issues with the slab vs issues with the coin.
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