SOUTH WEST AFRICA 1949 UPU 3d bright blue variety, SG140aSouth West Africa 1949 75th Anniversary of the Universal Postal Union 3d bright blue, upper left corner block of 4, upper left stamp (R1 1) showing variety 'Serif on C', SG140a. A very fine unmounted mint positional block with full original gum. Stamps issued to celebrate the 75th anniversary of the Universal Postal Union featured 310 stamps in total across 84 different countries. This was only the second British Empire Omnibus issue not to mark a