Question: When did the first 1 coin come out?
Disambiguated questions and answers: question: When did the first British one pound coin come out?
When did the first United States dollar coin come out?
When did the first 1-yen coin come out in Japan?
When did the first 1-euro coin come out?
When did the first Australian one dollar coin come out?
answer: 21 April 1983
1794
1870
2002
14 May 1984
Natural Questions answer: on 21 April 1983 (from the Wikipedia article "One pound (British coin)")