Numismatic definitions
Like most fields of expertise, numismatics has its own lingo. Find the numismatic definition of a term by entering it in the field below.
Master die
The coin design is cut directly into tool steel using a computer-controlled engraving machine, creating what is known as a reduction punch. This process takes up to 24 hours. The reduction punch contains a positive (raised or relief) impression of the complete design of the coin.
The reduction punch is placed in an hydraulic press. In a process known as hobbing, the design is transferred onto a softened steel block, using 100 to 400 tonnes of pressure. The result is a master die, containing a negative impression of the coin design.
