SWITZERLAND – 1938, Swiss Pro Aero stamp – worth $9,000
Swiss Pro Aero stamp was issued in 1938 to promote the Pro Aero Campaign, held throughout Switzerland from May 21 through May 22, 1938. This […]
Swiss Pro Aero stamp was issued in 1938 to promote the Pro Aero Campaign, held throughout Switzerland from May 21 through May 22, 1938. This […]
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