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U.S. Decca. https://archive.org/details/78_chicago_ ... ET_EQ.flac

Yes, I forgot that detail about underlined citations. But sometimes I've found differences among the Rust data and the actual records. This US Decca pressing may be one. The original UK Decca matrix numbers 'GB-6041-1D' are actually there on the runout area of my copy; they are unmistakable, by their stamping style (the small capital letters). They used an original British metal part. And at US Decca they added the -2C identification directly to the stamper, carefully behind the original UK numbers. The typeface of this suffix is typical of early US Decca (curly big typos). Presumably they have several of these imported metal parts, or a mother from which they processed the pressing stampers.

This says for Decca M-438 :

http://www.45worlds.com/78rpm/record/m438

A mx: GB6039-1; B mx: GB6041-2

So now, as per Rust, Chicago IS the 2nd take. But Harlem Speaks is the 1st, which again contradicts Rust for M-438. Pity the runout area of the record in the link is not actually shown.