Thanks to Agostino Cirillo for suggesting me the article by C. Walthall, “Portraits of Johann Joachim Quantz” published in 1986 in the journal Early Music which identifies the manuscript of the concert no. 85 in A major QV5:218 in Gerhardt’s 1735 portrait of Quantz.
Here you can find the details of the portrait and of my transcription in modern notation, available on this site.
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