what is the machin s mills halfpenny

1787 Machin s Mills Halfpenny PCGS AU55 — Inde Et Lib1787 Machin s Mills Halfpenny Vlack 21-87D R 4 PCGS AU55 ex Newman A great Machin s Mills copper excellent as a date or type coin but also a condition census example of the die variety Well struck on a high quality planchet There is hardly any wear and subtle traces of the coin s -what is the machin s mills halfpenny-,Machin s mills coins Coin TalkDoes anyone have any info regarding these How to determine one is a machin s mill imitation halfpenny vs an actual halfpenny I have my eyes on ……

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