According to us, the likelihood of the authenticity of Fontana's fingering in EE is minimal. In EE1, it clearly contains a mistake – the 3-5 sequence under the 4th and 5th semiquavers is very inconvenient. The mistake was corrected in EE2 (→EE3), changing the digit under g2 to a '4'. However, it seems to be more likely that Fontana projected the fingers 3-4 for these notes in order to avoid the 5th finger on the black key – the use of the regular scheme 512451... would not have required such a detailed marking; it would have been enough to repeat 51 at the beginning of the subsequent groups of semiquavers, like in bars 142-143.
Compare the passage in the sources»
category imprint: Differences between sources
issues: EE revisions, Errors in EE
notation: Fingering