Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 567:
1911, ”El Labrador” issue, enlarged artist’s proof of 5c in black on thickened paper, size 90x115mm, in addition plate proof in red of the same value, both mounted on page from a Collection, slight paper wrinkles from mounts, otherwise VF, Est. $300-$400, Scott #177
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