Ancient coins were made by metalworkers using a hammering technique that carved markings onto the coin's surface. The markings or images that the coin maker wanted to engrave were cut into two dies: an upper die and a lower die. They positioned a blank (an unadorned piece of metal) in between the dies. The higher die would then be struck by the metalworker. The power used to strike the blank engraves the blank with the markings from both dies. The coin naturally took on a somewhat rounded shape when hit with a hammer.
The time of hammer striking is over. Instead, in order to enhance productivity and cut costs, mints make coins in vast quantities using large machinery. A plaster model of the coin is constructed prior to striking, and this more standardized procedure than in the past is utilized to create master dies. Metal sheets are used to make blanks, which are run through a blanking press to create blanks in the form of rounded discs. When ready, blank coins are put through a coin press that can strike up to 720 coins each minute.
It appears to be as simple to create round coins as in any other shape with the advancements in technology. However, round coins continue to be the most often used coin type globally. It’s difficult to change habits and traditions once ingrained into society.
Although modern coins are most frequently round, there are many other shapes that are used in the today, including triangular, rectangular, octagonal, scalloped, and other unusual designs.
The Chinese dragon is depicted on the reverse of the 2023 1 oz Rectangular Silver Dragon Coin. It depicts the serpent-like beast slithering above the enormous wealth around it.
Coin Highlights:
On the obverse of each 2023 Australian Rectangular Silver Dragon Coin, is the final effigy of the late Elizabeth II.
Reference
https://www.jmbullion.com/2023-1-oz-australian-rectangular-silver-dragon-coin/
https://www.usmint.gov/learn/production-process/coin-production
https://www.thesprucecrafts.com/how-are-coins-made-4589253
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