Used exclusively from 1985 through 1989, this mint mark is distinguishable from all others by the fact that the inside of the upper loop is noticeably smaller than the inside of the lower loop. Of course there is little need to compare it to anything as this mint mark type isd known to have been used exclusively during that period of time with no contemporary counterparts.
Mint mark types · San Francisco (S)
S-MMT15 (Large-bottom S)
[1985-1989]
First of the late Lincoln cent large proof mint marks
Catalogued dies
Dies tagged with this mintmark punch profile.
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Related reference
All mint mark types Design types Design varieties S mintmark timeline