1 Penny - Edward I Dublin mint

Edward I's Irish pennies were struck as part of a deliberate monetary reform — the same recoinage program he imposed across England and Wales in 1279, extended to Ireland to bring the colony's currency into conformity with English standards. The Dublin mint was the primary Irish production centre, though Waterford and Cork operated briefly under the same program. Output was substantial enough to displace the earlier, lighter voided cross pennies that had circulated since the reign of John.

The Dublin mint's product is distinguished from its English counterparts by consistent minor weight differentials — Irish coins were struck fractionally lighter in practice, a persistent feature of colonial minting throughout this period.