Agora Auctions, LLC
Numismatic Auction 23 23 December 2014
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From David Sear, Roman Coins and Their Values, Millenium edition, 2000: "The explanation of the abbreviation PNG has not been satisfactorily resolved: Pondus Nummorum Restitutum (the weight of the coinage restored) and Ponderum Norma Restitua (the standard of the weights restored) have both been suggested.