Issued by Ireland in 1966, this 7 pence commemorative stamp honors Seán Mac Diarmada (1883–1916), one of the seven signatories of the 1916 Easter Rising Proclamation. The minimalist design features his portrait on a turquoise field, flanked by the years 1916 and 1966, marking the 50th anniversary of the Rising. The clean layout reflects the solemn respect of the nation’s golden jubilee of independence.

Historical Context:
Seán Mac Diarmada was a key organizer of the Irish Republican Brotherhood and a leading figure in the Easter Rising. Executed by the British for his role in the rebellion, he became a martyr for Irish freedom. This stamp was part of a series commemorating the revolutionary leaders of 1916.