Very little. There would be many of them in Ireland still, so they have no value as a collector's item. They would also have very little value in monetary terms, just about 7 or 8 US cent.
Eire is the Irish name for Ireland. 5p refers to a 5 Pence coin.
Eire 1982 Buffalo and harp 5p
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how much is a 10p1976 eire coin
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5p per hour