Which old Irish old pennies are worth money?

Old Irish pennies, particularly those minted before 1928 and featuring the harp design, can be valuable to collectors. Coins in good condition from the early 20th century, such as the 1928 and 1937 issues, may fetch higher prices. Additionally, rare varieties or those with minting errors can also hold significant value. Always consult a reputable coin dealer or reference guide for specific valuations.