AW
Main text
AT - Autograph of a fragment
AW - Presentation Autograph
CDP - Copy for Delfina Potocka
GC - Gutmann's Copy
FE - French edition
FE1 - First French edition
FE2 - Corrected reprint of FE1
FED - Dubois copy
FEJ - Jędrzejewicz copy
FES - Stirling copy
GE - German edition
GE1 - First German edition
GE1a - Corrected reprint of GE1
GE1b - Flawed impression of GE1
GE2 - Second German edition
GE3 - Revised impression of GE2
EE - English edition
EE1 - First English edition
EE2 - Corrected reprint of EE1
EE3 - Revised impression of EE2
compare
  b. 1

In AT, AW and CDP, there is no cautionary flat before the 4th crotchet (b). It may mean that Chopin added the sign in [A], at the time of preparing the Etude for print, shortly before giving [A] for copying. 

Compare the passage in the sources »

category imprint: Differences between sources

issues: Cautionary accidentals

notation: Pitch

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