J. N. Larned, History for ready reference, Volume 3… (1895)
“ Swift either shared or took advantage of the general belief that the mysteries of the currency are unfathomable to the human intelligence. ... There is, however, no real mystery about the halfpence. The small coins which do not form part of the legal-tender may be considered primarily as counters. A penny is a penny, so long as twelve are change for a shilling. It is not in the least necessary for this purpose that the copper contained in the twelve penny pieces should be worth or nearly worth a shilling. ... At the present day bronze worth only twopence is coined into twelve penny pieces. ”
