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The term is actually a technicality. According to the Red Book, the mint marks for all 1921 D and S silver dollars were made with a punch that was much smaller than that used on earlier Morgans.

Thus all 1921 Morgans are classed as having "micro-S" or "micro-D" mint marks, but it means the D and S are smaller than other dates rather than meaning there are two different sized for 1921 coins.

Please see the Related Question for more information and values.

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13y ago

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