Plate image from (5th edition). This note appeared in Ford III (Stack's May 2004, lot 684) and was there cataloged as a likely counterfeit.

David Gladfelter agrees with Stack's assessment and notes the following differences between this note and the 15 shilling note of the same issue:

The middle horizontal lines of the capital letters “E” in the word INDENTED are longer on the 15s bill, and on the 12s plate specimen in the 4th edition of Newman, than on the 6s note.
The loops of the lower case letters “g” of the regular font are approximately equal in size on the 6s note but on the 15s bill the top loop is smaller.
The woodcut at the top of the 15s bill incorporates the double valuations into the design, as does the 12s plate specimen in the 4th edition of Newman, but that on the 6s bill does not.
The indentation on the 15s bill is more pronounced than that on the 6s note.
The animals on the royal arms of the 6s look emaciated compared with those on the 15s bill.

For further information, see Gladfelter's article, “Sheep Here, Goats There: Some Distinguishing Characteristics of Genuine and Counterfeit 1724 New Jersey Bills of Credit,” , Spring 2011.