The 
sign which occurs in GE was replaced by a 
in FE (→EE). This is probably a result of Chopin's proofreading, although both markings mean practically the same in that context. Chopin could have added in order to restore an ornament overlooked by the engraver.
In the main text we suggest supplementing 
relating to the upper note of the ornament. An unmarked use of a
1 between a minim a1 in bar 74 and a quaver a1 in bar 75 seems unlikely.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: Inaccuracies in GE, Inaccuracies in FE, Omission of current key accidentals, Authentic corrections of FE
notation: Ornaments