Issues : Last key signature sign

b. 51

composition: Op. 63 No. 1, Mazurka in B major

..

In the main text we add a cautionary  to b, as it was performed in GE3. The accidental is also in AI, perhaps by mistake, since it does not include the necessary  lowering a to a

category imprint: Differences between sources; Editorial revisions

issues: GE revisions , Cautionary accidentals , Omission of current key accidentals , Accidental below/above the note , Last key signature sign

b. 53-56

composition: Op. 63 No. 1, Mazurka in B major

..

In AI, in each of these bars, Chopin wrote a  (cautionary?) to a. The fact that this unnecessary accidental was repeated a few times suggests that the composer was uncertain about the presence of the  raising a in the key signature of the B major/G minor keys. Cf. the Etude in G minor, Op. 25 No. 6, bars 7-8.

category imprint: Source & stylistic information

issues: Cautionary accidentals , Last key signature sign

b. 71

composition: Op. 63 No. 1, Mazurka in B major

..

In the main text we omit the unjustified (cautionary?)  before a1 that appears in all editions.

category imprint: Editorial revisions

issues: Cautionary accidentals , Last key signature sign