Ireland minted these half pennies, with the pig and piglets, from 1928 to 1967. There are a few better dates in the series, but most dates catalog as follows:
worn: less than $1 US dollar approximate catalog value
average circulated: less than $1
well preserved: less than $1
fully uncirculated: $3
Here are the better dates (you've got one, Flint). The values in the list below are for coins in well preserved condition. Coins in average circulated condition are worth about one-quarter of these values.
1928: $5 US dollars
As always on CoinQuest, all values here are catalog values. You must adjust them to get actual buy and sell values. See our Important Terminology page for making these adjustments.