1943 Centenary of Discovery of Quaternions by Rowan Hamilton (Set of 2) on Plain FDC

Irish Commemorative Stamps: 1943 Centenary of Discovery of Quaternions by Rowan Hamilton – Set of 2 on ‘plain’ FDC

Irish Commemorative Stamps: 1943 Centenary of Discovery of Quaternions by Rowan Hamilton (Set of 2) on Plain FDC   Other Irish Stamps in this series: Irish Commemorative Stamps 1929-59: Irish Commemorative Stamps: 1929-1939 Irish Commemorative Stamps: 1940-1949 Irish Commemorative Stamps: 1950-1959      

1943 Centenary of Discovery of Quaternions by Rowan Hamilton, 2½d Brown

Irish Commemorative Stamps: 1943 Centenary of Discovery of Quaternions by Rowan Hamilton – 2½d Brown

Irish Commemorative Stamps: 1943 Centenary of Discovery of Quaternions by Rowan Hamilton, 2½d Brown   Other Irish Stamps in this series: Irish Commemorative Stamps 1929-59: Irish Commemorative Stamps: 1929-1939 Irish Commemorative Stamps: 1940-1949 Irish Commemorative Stamps: 1950-1959      

1943 Centenary of Discovery of Quaternions by Rowan Hamilton, ½d Green

Irish Commemorative Stamps: 1943 Centenary of Discovery of Quaternions by Rowan Hamilton – ½d Green

Irish Commemorative Stamps: 1943 Centenary of Discovery of Quaternions by Rowan Hamilton, ½d Green   Other Irish Stamps in this series: Irish Commemorative Stamps 1929-59: Irish Commemorative Stamps: 1929-1939 Irish Commemorative Stamps: 1940-1949 Irish Commemorative Stamps: 1950-1959      

1943 50th. Anniversary of the Founding of the Gaelic League by Douglas Hyde, 2½d Claret

Irish Commemorative Stamps: 1943 50th. Anniversary of the Founding of the Gaelic League by Douglas Hyde – 2½d Claret

Irish Commemorative Stamps: 1943 50th. Anniversary of the Founding of the Gaelic League by Douglas Hyde, 2½d Claret   Other Irish Stamps in this series: Irish Commemorative Stamps 1929-59: Irish Commemorative Stamps: 1929-1939 Irish Commemorative Stamps: 1940-1949 Irish Commemorative Stamps: 1950-1959      

1943 50th. Anniversary of the Gaelic League, ½d Green

Irish Commemorative Stamps: 1943 50th. Anniversary of the Founding of the Gaelic League by Douglas Hyde – ½d Green

Irish Commemorative Stamps: 1943 50th. Anniversary of the Founding of the Gaelic League by Douglas Hyde, ½d Green   Other Irish Stamps in this series: Irish Commemorative Stamps 1929-59: Irish Commemorative Stamps: 1929-1939 Irish Commemorative Stamps: 1940-1949 Irish Commemorative Stamps: 1950-1959      

1943 50th. Anniversary of the Gaelic League, founded by Dr. Douglas Hyde (Set of 2)

Irish Commemorative Stamps: 1943 50th Anniversary of the Gaelic League, founded by Dr. Douglas Hyde

Irish Commemorative Stamps: 1943 50th Anniversary of the Gaelic League, founded by Dr. Douglas Hyde   Other Irish Stamps in this series: Irish Commemorative Stamps 1929-59: Irish Commemorative Stamps: 1929-1939 Irish Commemorative Stamps: 1940-1949 Irish Commemorative Stamps: 1950-1959      

1943 Centenary of Discovery of Quaternions by Rowan Hamilton (Set of 2) in Gutter Pairs

Irish Commemorative Stamps: 1943 Centenary of Discovery of Quaternions by Rowan Hamilton (Set of 2) in Gutter Pairs

Irish Commemorative Stamps: 1943 Centenary of Discovery of Quaternions by Rowan Hamilton (Set of 2) in Gutter Pairs   Other Irish Stamps in this series: Irish Commemorative Stamps 1929-59: Irish Commemorative Stamps: 1929-1939 Irish Commemorative Stamps: 1940-1949 Irish Commemorative Stamps: 1950-1959      

1943 Centenary of Discovery of Quaternions by Rowan Hamilton (Set of 2)

Irish Commemorative Stamps: 1943 Centenary of Discovery of Quaternions by Rowan Hamilton (Set of 2)

Irish Commemorative Stamps: 1943 Centenary of Discovery of Quaternions by Rowan Hamilton (Set of 2)   Other Irish Stamps in this series: Irish Commemorative Stamps 1929-59: Irish Commemorative Stamps: 1929-1939 Irish Commemorative Stamps: 1940-1949 Irish Commemorative Stamps: 1950-1959      

1943 Centenary of Discovery of Quaternions by Rowan Hamilton (Set of 2) on Plain, hand-addressed FDC

Irish Commemorative Stamps: 1943 Centenary of Discovery of Quaternions by Rowan Hamilton (Set of 2) on Plain, hand-addressed FDC

Irish Commemorative Stamps: 1943 Centenary of Discovery of Quaternions by Rowan Hamilton (Set of 2) on Plain, hand-addressed FDC   Other Irish Stamps in this series: Irish Commemorative Stamps 1929-59: Irish Commemorative Stamps: 1929-1939 Irish Commemorative Stamps: 1940-1949 Irish Commemorative Stamps: 1950-1959