Japanese Yen - Coins

Coins

Coins were introduced in 1870. There were silver 5, 10, 20 and 50 sen and 1 yen, and gold 2, 5, 10 and 20 yen. Gold 1 yen were introduced in 1871, followed by copper 1 rin, ½, 1 and 2 sen in 1873.

Cupronickel 5 sen coins were introduced in 1889. In 1897, the silver 1 yen coin was demonetized and the sizes of the gold coins were reduced by 50%, with 5, 10 and 20 yen coins issued. In 1920, cupro-nickel 10 sen coins were introduced.

Production of silver coins ceased in 1938, after which a variety of base metals were used to produce 1, 5 and 10 sen coins during the Second World War. Clay 5 and 10 sen coins were produced in 1945 but not issued for circulation.

After the war, brass 50 sen, 1 and 5 yen were introduced between 1946 and 1948. In 1949, the current type of holed 5 yen was introduced, followed by bronze 10 yen (of the type still in circulation) in 1951.

Coins in denominations of less than 1 yen became invalid on December 31, 1953, following enforcement of the Small Currency Disposition and Fractional Rounding in Payments Act (小額通貨の整理及び支払金の端数計算に関する法律, Shōgaku tsūka no seiri oyobi shiharaikin no hasūkeisan ni kan suru hōritsu?).

In 1955 the current type of aluminium 1 yen was introduced, along with unholed, nickel 50 yen. In 1957, silver 100 yen pieces were introduced. These were replaced in 1967 by the current, cupro-nickel type, along with the holed 50 yen coin. In 1982 the first 500 yen coins were introduced.

The date (expressed as the year in the reign of the emperor at the time the coin was stamped) is on the reverse of all coins, and, in most cases, country name (through 1945, 大日本 or Dai Nippon, "Great Japan"; after 1945, 日本国, Nihon koku, "State of Japan") and the value in kanji is on the obverse, except for the present 5-yen coin where the country name is on the reverse.

As of April 2011 the 500 yen coin was the highest-valued coin to be used regularly in the world (depending on exchange rates, the rarely used 5 Cuban convertible peso coin is sometimes the highest-valued), with value of over US$6. Because of this high face value, the 500 yen has been a favorite target for counterfeiters; it was counterfeited to such an extent that in 2000 a new series of coins was issued with various security features, but counterfeiting continued.

The 1 yen coin is made out of 100% aluminum and can float on water if placed correctly.

On various occasions, commemorative coins are minted, often in gold and silver with face values up to 100,000 yen. The first of these were silver ¥100 and ¥1000 Summer Olympic coins issued on the occasion of the 1964 games. Recently this practice is undertaken with the 500 yen coin, the first two types were issued in 1985 in commemoration of the science and technology exposition in Tsukuba and the 100th anniversary of the Governmental Cabinet system. The current commemorative 500 and 1000 yen coin series honouring the 47 prefectures of Japan commenced in 2008, with 47 unique designs planned for each denomination. Only one coin per customer is available from banks in each prefecture. 100,000 of each 1000 yen silver coin have been minted. Even though all commemorative coins can be spent like ordinary (non-commemorative) coins, they are not seen often in typical daily use and normally do not circulate.

Instead of displaying the CE year of mintage like most nations' coins, yen coins instead display the year of the current emperor's reign. For example, a coin minted in 2009 would bear the date Heisei 21 (the 21st year of Emperor Akihito's reign).

Due to the great differences in style, size, weight and the pattern present on the edge of the coin they are very easy for people with visual impairments to tell apart from one another.