Colombia 1942 — "Buzon" (picked up from a mail box) on airmails, on each year to Argentina, 3 covers with…

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1942-44. "BUZON" (picked up from a mail box) on airmails, on each year to Argentina, 3 covers with 45c postage plus 0.5c mandatory surcharge. Barranquilla to Buenos Aires with mechanical receivers, a couple stating "delayed plane" (Avion atrasado). FINE, VERY FINE.