The Mystery of the Proof 1875 Gold Dollar

As I have mentioned before, certified population figures can be helpful but they can also be confusing. Take, for instance, the 1875 gold dollar in Proof. This is a coin with a reported original mintage of 20. But it has a combined PCGS/NGC population of 24 (twelve at each service). Something is obviously not right here. But, for once, the fault does not lie with the population reports.   
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