C6P, 1938 6c Blue air post, plate proof on India, left margin vertical pair on original card backing, the other three sides have wide even margins, extremely fine and scarce with only 200 pairs possible though much less actually because of position pieces.
C6P, 1938 6c Blue air post, plate proof on India, left margin vertical pair on original card backing, the other three sides have wide even margins, extremely fine and scarce with only 200 pairs possible though much less actually because of position pieces.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
