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(en) Instead of hammering each coin, long strips of metal are fed through a waterwheel-powered roller mill having two rollers on which the front and back images of the coin are engraved, allowing to produce up to 20 coins per strip. The metal strip was lengthened during the process so that a circular image became an oval one. Therefore, engravings on rollers had to be counter-ovaled in order to obtain circular coins. The finished coins were then cut from the strip in small screw presses. The two sides of the coins came out centered only if the rollers were perfectly synchronized.

This was a method used in a handful of European mints like Segovia, Spain and Halle, Austria in the 16th century. It is also used since the 20th to produce souvenir elongated coins.

Produced with this technique

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