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Thanks for your contribution Jolyon. I am in fact following all such advice
and practices as you describe. We're working on the presumption that
standard pitch seems to have been adopted in Argentina sometime during the
late 30s. Regardless of how true that is, our presumption is supported by
most other discs in the series produced during the 1950's which render more
or less reliably A442ish at nominal 78rpm. 
However, my question to the list was aimed not so much at resolving the
pitching/speed conundrum per se, but in the hope of discovering whether
anyone might offer an insight into why speeds were inconsistent across the
two sides of discs recorded on the same day and bearing adjacent matrices,
and also, why or how certain recordings of this period change pitch during
the side.