The 
hairpin was written into FC (→GE) by Chopin. An exact placement of the right-hand end of the mark is impossible due to the way Chopin wrote longer rhythmic values: in b. 72 the mark reaches the dotted minim in the bottom voice of the R.H., which is, however, written between the 2nd and 3rd quavers of the L.H. In the main text we place the end of the mark in a way that it does not go beyond the notes of the chord that opens the bar. In GE2 (→GE3) the mark was shortened even more by adjusting it to the size of the bar.
See b. 65-66
Compare the passage in the sources»
category imprint: Graphic ambiguousness; Differences between sources
issues: Scope of dynamic hairpins, GE revisions, Authentic corrections of FC
notation: Articulation, Accents, Hairpins