Going through an uncirculated roll of 1957d I found these 1MM-007 in CopperCoins ( first time I found one of them ) with the marker on the E of ONE on the reverse
Thank you makecents, when I first saw I wasn't sure if it was an rpm ( I like to go around the mint marks to see it under different light positions before I put it back on the tube ) until I checked in CopperCoins and found that marker
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