The c-c1 octave at the last semiquaver in bar 53 was written by Chopin in AI after trying a number of different versions. The version, written in the final form in A, was then changed by Chopin for an a-f1 sixth at the time of proofreading FE (→GE,EE). Of course, the fingering added by Fontana in EE concerns only the last version (cf. bars 53-57).
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations
issues: Authentic corrections of FE
notation: Pitch