There are many more Farthings known than Halfpennies, with over 120 die varieties. The question is, which one, if not both circulated. I personally believe that both did, although to my knowledge, the Farthing cannot be confirmed.
From Notre Dame:
The problem for American colonial numismatics is we do not know exactly which kind of St. Patrick coppers Newby brought with him. It had long been thought only the large planchet coins were imported since the West New Jersey legislation spoke only of "halfpence" and until recently only the large planchet coins were considered to be halfpence. Also, in excavations of colonial sites only a few St. Patrick coppers have been found and they have been the larger planchet variety. However, according to Breen, a significant number of the smaller planchet St. Patrick coppers have been discovered in hoards with later 18th century coppers (Woods halfpence, Rosa Americana coppers and George II halfpence). Based on this evidence we can assume the smaller sized coin circulated in the colonies but we do not know for sure if they were part of Newby's 17th century supply or if they were brought over later in the 18th century.
From Notre Dame:
The problem for American colonial numismatics is we do not know exactly which kind of St. Patrick coppers Newby brought with him. It had long been thought only the large planchet coins were imported since the West New Jersey legislation spoke only of "halfpence" and until recently only the large planchet coins were considered to be halfpence. Also, in excavations of colonial sites only a few St. Patrick coppers have been found and they have been the larger planchet variety. However, according to Breen, a significant number of the smaller planchet St. Patrick coppers have been discovered in hoards with later 18th century coppers (Woods halfpence, Rosa Americana coppers and George II halfpence). Based on this evidence we can assume the smaller sized coin circulated in the colonies but we do not know for sure if they were part of Newby's 17th century supply or if they were brought over later in the 18th century.
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