Coins 1727 year of issue

Coins are often issued based on the experience and traditions of similar cultures, neighboring countries or metropolises. Chinese culture has influenced the development of Korea. In this country for many years they spoke the ancient Chinese language, coins were made similar to Chinese. Currency notes were not minted, as in Europe, but cast as in China.
The design was also similar - they were small, round coins, with a square hole in the middle. Holes, as well as in Chinese coins, were used for threading the lace, when stringing into bundles. In such a set could be up to 1000 coins, and a bundle denotes a monetary unit.
In 1727, Korea launches a coin of 99 percent copper, face value of 1 mun, of the Great Joseon Kingdom series. Weight: 4.5 g, with a smooth edge, raised, undecorated shoulder. On the front side: 4 characters - Sang-Tong-Pyong-Bo. The combination of these symbols corresponds to the meaning of the word: stability. These hieroglyphs are taken from the name Sanphoncheon - an institution that controls prices. On the back: two characters.
Another coin, 1 mun, weighing 4.5 g, which is produced this year, is slightly different in design and is made with a copper coating.
Two coins, face value 2 muna, are made of cast copper or brass. The design is also slightly different from each other. Weight ranges from 8 to 9 g, size - from 27 mm to 28 mm.
Two more coins, produced in 1727, in denominations of 1 mun, do not have a reliable image and a clear description.
The coin mun until the end of the XIX century occupies a leading position within the country and is replaced only after the introduction of the decimal order of calculation. The Korean monetary system is developing under the influence of its stronger neighbors, China and Japan. In international payments, Korean money is not calculated, the mun is not recognized as a hard currency.