Posthistorie Nederland en Overzee - Losse kavels & poststukken - Nederland en Overzee - Poststukken
296/299, Zomerzegels 1937, mengfrankering op aangetekende envelop van Rotterdam naar Zurich (Zwitserland) met handtekening van ontwerper S.L. Hartz en Mevr. E. Reitsma-Valenca
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