15-Buenos Aires Postmarks, Part 2, the 1950s

The late Buenos Aires postmarks are found on covers mostly bearing the 40 centavos and the late 2 Pesos, because these two values were used well into the late 1950s. Here is a selection of three covers with late Buenos Aires postmarks (late from the reference point of the 1935-51 issue). Below is a Buenos Aires 14 cover to Belgium, followed by a detail of the postmark.

Here is a cover to Berlin, West Zone, with a Buenos Aires 60 (A) postmark. My guess is that the A stands for Aereo.
Below is a "SERVICIO AEROPOSTAL" Buenos Aires postmark from 1952 on a cover to England.
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