Linn’s Stamp News |
Canal Zone 50¢ Blackburn Official stamp offers both international and US appeal
Linn’s Stamp News 30, 1979. Many United States collectors are interested in Canal Zone stamps. On March 31, 1941, Canal Zone postal authorities issued a set of eight Official stamps produced by overprinting “Official Panama Canal” on definitive stamps of the 1928-40 series. |
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