Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - United States - 1925, Alaska Emergency Arctic Flight, Polar Bear and Iceberg, 10(c) in various color combinations on white paper, set of 12 different and one in black and blue imperf at bottom, a few with minor flaws, all with large part of OG, F/VF and scarce, Est. $250-$300