Question: When did the old pound coin come into circulation?
Disambiguated questions and answers: question: When did the old original pound coin come into circulation?
When did the old pound coin with a portrait by Raphael Maklouf come into circulation?
When did the old pound coin with a portrait by Ian Rank-Broadley come into circulation?
answer: 21 April 1983
1985
1998
Natural Questions answer: 21 April 1983 (from the Wikipedia article "One pound (British coin)")