Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 770:
1908-09, perforated proof of 10k in light blue, a single with margin at right, no varnish lines and three instead of two lines of inner oval at top, VF and scarce, expert’s hs in red, Est. $400-$600, Scott #79
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