Penny(in the sense of pound). Sixpenny, eightpenny, and tenpenny nails are nails of three sizes. A thousand of the first will weigh six pounds; of the second, eight pounds; of the third, ten pounds.
“One was to be tenpenny, another eleven, another sterling silver.” — Penny(A) (AngloSaxon, penning or penig). For many hundred years the unit of money currency, hence peningmoncgre (a moneychanger). There were two coins so named, one called the greater = the fifth part of a shilling, and the other called the less = the 12th part of a shilling.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894 More on Penny from Fact Monster:

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