This type of date error on Geo VI dimes is referred to in TRENDS as re-engraved date, for 1938-39-40. There are other years with the same error that are not listed. Can be 1-2-3 or all 4 digits.
Those are classic examples of MD ... machine or Mechanical Doubling. Take a look at some of Wexler's numerous papers on doubling and things just like that are under MD, a type of "worthless" doubling, as he puts it.
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