Collectors may wonder whether all these different design series actually circulate in the Isle of Man. Well, when I went there on holiday in 1981, I found three different design series in circulation (1971 to 1975, 1976 to 1979, as well as the new 1980 series, which ended in 1983), so I had fun picking all those coins out.
Because of the location of the Isle of Man in the Irish Sea, it receives lots of visitors from England, Scotland, Northern Ireland and the Republic of Ireland - though when I visited, it seemed as though, judging by the accents, the island had been taken over by the Northern Irish. Anyway, not only were there three design series of Manx coins in circulation, but UK coins circulated too. At the bar of my hotel, I often received change in Scottish or Northern Irish banknotes too. Some customers proffered banknotes or coins from the Republic of Ireland. I asked the barman how he dealt with that, because the Republic had broken the link with the UK pound sterling in 1979, and the Irish punt had depreciated against the pound sterling after that. The barman told me that he had no desire to upset his customers, so he maintained two cash drawers: one for the coins and banknotes of the Republic of Ireland, and one for all the rest. If someone paid him with a (Southern) Irish banknote, he gave them change in money from the Republic. I forgot to ask him what he did if he was paid with a mixture! In any case, I did find the odd few coins from the Republic of Ireland circulating on the island.