Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 8:
1912 (September 25), black-and-white PPC (Start of 20- Mile Speed Biplane Race from Grant Park, Chicago), sent from Chicago to Rothsay, MN, franked by Washington 1c green booklet stamp with straight edges at left and bottom, VF and scarce, Est. $150-$200, Sc. # 405b
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