1937, raccomandata di posta aerea da 18 gr. del 31.3.1937 da Roma a
Johannesburg (Sud Africa), trasportata dalle Imperial Airways sulla
linea Brindisi - Capetown, affrancata con Imperiale 50 c. + 1,25 L.
+ 5 L., integrata con un'affrancatura meccanica di L. 4,00, totale
L. 10,75 (porto estero 1,25, raccom. 1,50 L., 4 porti aerei 8,00
L.), timbro di transito di Brindisi al verso (Sass. 251, 253, 257)
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