Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 769:
1908, perforated proof of 7k in blue, side margin horizontal pair with 3 pearls at left on each stamp, printed on stamp paper with varnish lines, no gum as produced, VF and very rare, Est. $5,000-$6,000, Scott #78
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