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Waterspotting on Copper

Anyone got a feel for the effect that water spotting has on the grade of mint state copper at PCGS? The spotting occurred when the coins were minted and has subsequently toned (ie it is not PMD). Is it safe to assume a flat deduction? By this I mean what I'd grade a 66 would drop to a 65 with moderate spotting while a 65 would drop to a 64 for the same amount of spotting?
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