New coinage production techniques developed by the Mint of Poland
make striking the world possible.
The Mint of Poland has unveiled new technology allowing for the
creation of spherical (globe-shaped) coins. The technology was
announced in a presentation Jan. 29 during the technical forum
preceding the World Money Fair in Berlin
Siemowit Kalukiewicz, the chief operating officer of the Mint of
Poland, unveiled the 2015 Seven New Wonders of the World 7-ounce .999
fine silver $7 coin during the forum.
This commemorative coin was struck by the Mint of Poland, which
issued it in the name of Niue Island, a territory of New Zealand.
The coin features a design based on the 1638 hand-drawn world map
Nova totius terrarum orbis geographica ac hydrographica
tabula created by eminent Dutch cartographer Willem Janszoon
Blaeu. The map is in the collection of the Boston Public Library.
At different positions on the design’s historical map are seven
Swarovski crystals, one for each of the Seven New Wonders of the
World. The ”wonders” were announced July 7, 2007, after a global
contest to select them.
The list features Chichen Itza (Mexico), Christ the Redeemer statue
(Brazil), the Great Wall of China, Machu Picchu (Peru), the ancient
city of Petra (Jordan), the Taj Mahal (India), and the Roman Colosseum (Italy).
To create a spherical coin, the Mint of Poland first prepared and
evaluated a three-dimensional-model of the coin using Delcam’s
modelling software ArtCAM. To assure the coin’s ideal spherical shape
and map the images, engineers created a special six-piece die setup,
with hammer (top) and anvil (bottom) dies joined with four collar dies
on the sides.
According to Kalukiewicz, mint technicians first used blank dies to
strike test examples in copper. Then technicians struck copper and
silver test strikes with dies bearing designs, learning that perfectly
round blanks would not result in perfectly round coins.
The planchets were given a slightly raised, ridged area at the upper
pole. This was necessary so the globular shape remained intact when
the hammer die struck the planchet. It allowed the metal to flow just
where the mint technicians needed it, to produce the spherical shape
of the final product.
Kalukiewicz said it required 13 hours to laser-engrave each of the
four pieces of the collar (for a total of 52 hours) used in striking
this revolutionary new coin, and dozens of hours were needed to
laser-engrave the hammer and anvil dies.
Two strikes from the press were needed, the first strike using 600
kilonewtons of force and the second strike using 650 kilonewtons of force.
The coin has a diameter of 34 millimeters and weighs 217.7 grams.
The mintage limit is 1,007 pieces.
Both antique or oxidized and standard silver versions were created,
but the Mint of Poland has not confirmed whether each version has a
mintage of 1,007 pieces or if that limit will be distributed through
In addition, no distributor or pricing has been confirmed by press
time Feb. 19. Coin World will report the information when it becomes available.
Keep reading about world coins:
Lincoln joins Queen Elizabeth II on Niue Proof 2015 silver dollar
Pond from Anglo-Boer War a major South African rarity
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