L’article Austria Leopold V taler 1632 Hall est apparu en premier sur Numismeo.

L’article Austria Leopold I Thaler 1694 Hall est apparu en premier sur Numismeo.

The minting technique of the thalers of Leopold V (Archduke of Austria and Count of Tyrol), produced at the Hall in Tyrol mint around 1632, represents a major milestone in numismatic history. At that time, the Hall mint was one of the most modern in the world, utilizing a technology that was revolutionary for its era: the roller press (or Walzenprägung in German).

The Roller Press (Walzenprägung)

Unlike traditional hammer striking, where a metal blank was struck between two fixed dies, the roller press used two engraved steel cylinders.

• The Mechanism: The designs for the obverse (heads) and reverse (tails) were engraved directly onto the surface of two stacked rollers. A silver strip (known as a "zaine" or billet) was passed between these rollers, which were powered by a water wheel (hydraulic energy) or a horse mill.

• The Imprint: The enormous pressure exerted by the rollers impressed the design onto the silver strip as it passed through.

• The Cutting: Once the strip was printed, the individual coins were cut out using a blanking punch.

L’article Austria Leopold V thaler 1632 Hall est apparu en premier sur Numismeo.