Shapes
I attach scans of 3 covers; 2 from WW2 and 1 from Kenya during the Mau Mau uprising. My question is: what do the printed shapes on the air letters - the solid triangle from Calcutta and the triangle outline from Egypt - signify? Similarly, what does the black ink rubber diamond
from Kenya signify?
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Mike,
Would it not also be worth a mention that the black 'diamond' machine marks were also used in WW2 in the run up to D-Day as a security measure to prevent the location of troops being disclosed.
Peter