Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1143:
1909, perforated proof of 10k in light blue, top sheet margin single printed on wove paper with varnish lines, three instead of two lines of inner oval at top and other differences from issued stamp, nice condition, large part of OG, VF and scarce, several experts’ hs on reverse, a common stamp in pale blue (early printing) is included, Est. $500-$600., Sc. # 79
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