Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1081:
1963, two colorful air post registered covers from the same origin and destination (from Riga to London), franked by imperforate Cosmonauts souvenir sheet of 1962 and two se-tenant Space blocks of six (4 strips of three), all appropriate markings and arrival ds, mostly VF, Est. $150-$200, Scott #2631A imp, 2732
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