On ANY cent minted before 1990 - if the mintmark AND date are affected similarly, it is ALWAYS Machine Doubling.
These two features are placed into the die separately during the die making process, so there's NO way a doubled die could affect the mintmark, and there's NO way a repunched mintmark could cause a doubled die.
As of 1990 the mintmark was included as a part of the design on the master, so there is no such thing any more as repunched mintmarks. ANY doubling on the date would automatically affect the mintmark, so a doubled die that affects the date will also appear to be a repunched mintmark.
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