Mercury Dimes advice?

I agree.

That's it.

 

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I'm sure they do. But you are right - there are around 7000 '16D s slabbed by PCGS and only 300 or so of the '27's. But remember that this skews how many you are seeing of the more common type because people let go of them whereas they tend to hang onto their 16Ds, slabbed or not.

 

I think an important point that we did not mention is that, as you say, the low mintage was known early on and it's the collectors who increased the survival, whereas the common dates were circulated out of existence.
Also, with those PCGS survival estimates they are suggesting that there are about 17 of the1927's out there, including those seen by other TPGs, for every one they see, whereas less than one of the 16Ds for each of those 7000 they've handled.
That does seem plausible.

 

My apologies Jeff, you did mention that first point in your reply. Got distracted here. The question becomes just what size was that proportion of extra survival. With increases in communication ramping up probably rather high.