Martin Purdy
Martin Purdy of New Zealand writes:

Steve Feller
Steve Feller writes:

Chip Howell

Chip Howell writes:

Ron Haller-Williams
Ron Haller-Williams writes:

References:
United States dollar : Continental currency(https://en.wikipedia.org/wiki/United_States_dollar#Continental_currency)
Early American currency : Continental currency(https://en.wikipedia.org/wiki/Early_American_currency#Continental_currency)

Ron adds:

Douglas Mudd
American Numismatic Association Edward C. Rochette Money Museum Director Doug Mudd writes:

To read the earlier E-Sylum article, see:
SHILLINGS, PENCE, AND FARTHINGS (http://www.coinbooks.org/v21/esylum_v21n08a10.html)