There is no accidental before the 7th quaver in the sources, which makes us interpret it as f
1. The oversight of a 
returning f1 is proved by f1 present in the viola part in Morch. In the corresponding bar of the exposition (bar 140), Chopin wrote in the 1st half of the bar c
and e1 instead of d and f1, as a result of which a next to f1 is not necessary there.
Compare the passage in the sources »
category imprint: Interpretations within context; Editorial revisions
issues: Omissions to cancel alteration, Errors of A
notation: Pitch