Mexico 1935 20c lake, overprinted “Amelia Earhart Vuelo de Buena Voluntad Mexico 1935”, block of four, never hinged and post office fresh, scissors separated perfs at left, perfectly centered, v.f., signed Herbert Bloch, with 1981 Friedl certificate. A wonderful airpost and Mexico rarity, only 430 stamps were overprinted, few blocks exist (catalogue value for singles) (Catalog value $24,000)
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