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b. 18-19

composition: Op. 25 No 7, Etude in C♯ minor

No indications in GC (→GE) & EE

ten. in FE

..

The authenticity of the ten. indications does not raise any doubts here. Chopin added them in the proofreading of FE or – which is more likely – still in the handwritten base text to this edition. The second possibility is backed by the presence of such indications in analogous bar 43 and similar bars 60-61, also in other sources – in bar 43 in GC, while in bars 60-61 in EE. Chopin could have added them subsequently in various manuscripts, however, he did not pay attention to synchronising the additions. 

category imprint: Differences between sources; Corrections & alterations

issues: Authentic corrections of FE

b. 19-20

composition: Op. 25 No 7, Etude in C♯ minor

Fingering written into FES

No teaching fingering

..

The fingering written in pencil by Chopin in FES. The last two numerals are written over them in ink by the pupil.

category imprint: Differences between sources

issues: Annotations in teaching copies , Annotations in FES

b. 19

composition: Op. 25 No 7, Etude in C♯ minor

in GC (→GE), FE & EE3

No marking in EE1 (→EE2)

..

The absence of  in both first impressions of EE suggests that it was also absent in the base text to this edition. The addition in EE3 was introduced – as many others in the entire Op. 25 – probably on the basis of GE.

category imprint: Differences between sources

issues: EE revisions

b. 21

composition: Op. 25 No 7, Etude in C♯ minor

No fingering in GC (→GE), FE & EE1

Fingering in EE2 (→EE3)

..

The fingering of EE2 (→EE3) is certainly non-authentic.

category imprint: Differences between sources

issues: EE revisions

b. 22

composition: Op. 25 No 7, Etude in C♯ minor

Fingering written into FED

Fingering written into FES

No teaching fingering

Fingering in EE2 (→EE3)

..

In the main text we give the fingering written with Chopin's hand in FED. The digits added in FES undoubtedly define the same fingering. The fingering of EE2 (→EE3), in the initial phase different from the Chopin one, although equally justified from the pianistic point of view, is certainly non-authentic.

category imprint: Differences between sources

issues: Annotations in teaching copies , EE revisions , Annotations in FED , Annotations in FES