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right hand corner marginal block of four printed by Bradbury Wilkinson
These equations are thought to relate to his 'metric tensor
Swaziland 1962-66 ½c black
The 10½ perforated was changed in August 1934 to 11½ due to difficulties experienced in separating the stamps in the first perforation
Australia New South Wales 1882-85 3d yellow-green Official
New Zealand 1936 Bradbury Wilkinson engraved essay die proofs Historical right hand corner marginal blockNew Zealand 1936 Bradbury Wilkinson stamp size un denominated engraved essay die proofs. Portrait of King Edward VIII facing three quarters to left, each with frame and inscriptions as subsequently adopted for the King George VI d to 9d stamps, respectively in carmine (with portrait of the King in military uniform) and in blue green (with portrait of the King in garter robes). The pair are inset side by side in a single piece of grey board