Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 40:
1919-21, Alcock and Brown Flight, black surcharge $1 on 15c scarlet, and Halifax Airmail, black surcharge with period after ”1921” $1 on 35c red, nicely centered, large part of OG, VF, C.v. $370, Unitrade C.v. CAD$550, Est. $120-$150, Scott #C2, C3b
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