Lack of the 
before the 6th semiquaver of the bottom voice in AI means that in both bars it is to be a c
1. According to us, one can have doubts whether this version was really intended by Chopin:
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Chopin would frequently put an accidental next to the subsequent (and not first) appearance of the altered note. In this case the reason could be writing the melodic line with a before the last note first, so when writing the bottom voice, the composer considered c1 to have been already marked;
- bar 74 is marked as repetition of bar 73, as a result of which the possible inaccurate notation appears only once.
However, using A as the 5th semiquaver in the L.H. is a strong argument for the authenticity of the literally interpreted version of AI.
In A (→FE→EE2→EE3), there is no before the last note in the R.H., which is a patent inaccuracy of the notation. In GE1 (→GE1a), the sign was completed in bar 74, while in the remaining editions – in both bars.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources; Corrections & alterations
issues: EE revisions, Accidentals in different octaves, GE revisions, Omission of current key accidentals
notation: Pitch