£40 - £50
1931 first flight covers, National Mail Service by seaplane 28.11.31 Panama/Puerto Armuelles with special receiving cachet, another but Panama/Anton, another but Colon/Panama, another but Bocas Del Toro/Panama, 1946 PAA/Panama/Corpus Christi, Texas official cover, all bear the appropriate cachets & b/stamps etc.
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