It is possible that he doesn't like the toning (too dark) or the fingerprint in the toning on the obverse at 12 o'clock. Hard to tell on my phone, but there could be more prints at 3-5 on the obverse.
Surf
Seems to me that your grading results indicate that PCGS graded accurately. And CAC agreed with the grades as being A or B for the grade. What is to be gleaned? CAC and PCGS agree on the grades in the sub most of the time, at the high end of the gra…