International Brigades, air mail cover to Prague with censor and rare mute postmark

Reference: C00411

International Brigades, air mail cover to Prague with censor Heller 5a and rare mute postmark formed by three concentrical circles. This is the first time we see such a postmark on an International Brigades cover. On the back, Paris transit of September 8, 1937 and Prague arrival marks dated on September 9, 1937.

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International Brigades, air mail cover to Prague with censor Heller 5a and rare mute postmark formed by three concentrical circles. This is the first time we see such a postmark on an International Brigades cover. On the back, Paris transit of September 8, 1937 and Prague arrival marks dated on September 9, 1937.