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I'm pretty sure PCGS would up it to a 66. They love toners.
that is true, however, when they assess toning when it comes to eye appeal it can lower the grade, have no impact on it, or increase the grade. PCGS looks for clean, attractive toning on silver coins, with strict minimum standards for high grades. Splotchy or deep toning can hurt eye appeal. Positive toning is generally desirable, but splotchy toning or deeply embedded toning is never rated as positive
in the case of this coin, I believe that PCGS/NGC or even ANACS would see this toning as below average for eye appeal.