Castaing machine
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The Castaing machine is a device used to add lettering and decoration to the edge of a coin. Such lettering was necessitated by counterfeiting and edge clipping, which was a common problem resulting f
A Castaing machine, on display at the American Numismatic Association museum.
Aubin Olivier introduced the coinage press to France.
A 1573 French piedfort produced using a split collar, with its edge lettering shown beneath
A 1701 gold Louis d'or, overstruck using Castaing's method. An older 1690s date is visible on the reverse.
Milled coinage
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In numismatics, the term milled coinage is used to describe coins which are produced by some form of machine, rather than by manually hammering coin blanks between two dies or casting coins from dies.
Castaing machine
…counterfeiting and edge clipping, which was a common problem resulting from the uneven and irregular hammered coinage. When Aubin Olivier introduced milled coinage to France, he also developed a method of marking the edges with lettering which would make it possible to detect if metal had been shaved from the edge…
Milled edges of Indian five rupees coins
A mill for the production of 'milled' coins with both coin dies illustrated.
A mill for inscribing or milling the edges of coin flans or planchets.
French-made coining press from 1831 (National Archaeological Museum of Spain, Madrid)