Question: When did the first 1 coin come out?

Disambiguated questions and answers:
context: The British one pound (£1) coin is a denomination of the pound sterling. Its obverse bears the Latin engraving ELIZABETH II D G REG (“Dei Gratia Regina”) F D ("Fidei defensor") meaning, “Elizabeth II, by the grace of God, Queen, Defender of the Faith”. It has featured the profile of Queen Elizabeth II since the original coin's introduction on 21 April 1983. Four different portraits of the Queen have been used, with the latest design by Jody Clark being introduced in 2015. The design on the reverse side of the current, 12-sided coin features four emblems to represent each of the nations of the United Kingdom—the English rose, the leek for Wales, the Scottish thistle, and the shamrock for Northern Ireland—emerging from a single stem within a crown. 
question: When did the first British one pound coin come out?
short_answers: 21 April 1983
wikipage: One pound (British coin)
context: No context provided
question: When did the first United States dollar coin come out?
short_answers: 1794
context: The first Japanese one-yen coin was minted in 1870, at first these coins were primarily minted in silver. The obverse of these coins featured a dragon with a circular inscription around it. The reverse had a radiant sun surrounded by a wreath, with the chrysanthemum emblem (a symbol of the Japanese Imperial Family) flanked by two seals of the Japanese government. The following year though Japan switched to the Gold standard in order to keep up with countries in North America, and Europe. Production of silver one-yen coins was halted, and new small gold coins took their place. Through 1874-1875, one-yen silver coins were again minted with a new design only to be halted again sometime in 1875 in favor of "Trade Dollars". Both silver and gold coins co-circulated after 1878 when Japan went with a bimetallic standard, and production again resumed of silver one-yen coins. Gold one-yen coins were minted until 1880, while the silver ones lasted until 1914.
question: When did the first 1-yen coin come out in Japan?
short_answers: 1870
wikipage: 1 yen coin
context: There are several error 1-euro coins: Italian types from 2002 without mintmarks; Portuguese coins, also from 2002 with another type of edging (29 stripes instead of 28) and from 2008 with the first type of the common side, officially used until 2007; and the famous Monegasque coin from 2007 without mint marks.
question: When did the first 1-euro coin come out?
short_answers: 2002
wikipage: 1 euro coin
context: It was first issued on 14 May 1984 to replace the one-dollar note which was then in circulation, although plans to introduce a dollar coin had existed since the mid-1970s. The first year of minting saw 186.3 million of the coins produced at the Royal Australian Mint in Canberra.
question: When did the first Australian one dollar coin come out?
short_answers: 14 May 1984
wikipage: Australian one dollar coin

Long-form answers:
long_answer: The first dollar coin came out in the United States in 1794. In Japan, the first yen coin came out in 1870. The first British pound coin came out 21 April 1983, the first Euro coin in 2002, and in Australia the first one dollar coin came out 14 May 1984.