A scale, 19th century, used to describe the size of coins, medallions, and similar flat round objects, adopted by the Numismatic Society of Philadelphia in 1858. The interval of the scale is one-sixteenth of an inch of diameter. The scale numbers increase as the size of the coin increases. Thus a number 16 coin is one inch in diameter.
Proceedings of the Numismatic and Antiquarian Society of Philadelphia (1865–1866).
Preface, page 4.
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Last revised: 8 March 2008.