Babikov informs that Natasha was written in 1921 during VN’s vacations in Berlin, while away from Cambridge. The New Yorker edition informs Natahsa was written circa 1924.  Which information is correct?  I would be very thankful if anyone could clarify me on this matter.  Babikov also mentioned B.Boyd but his reference could not be found.Cf.Volume 24 n°1 :Vladimir Nabokov, Annotating vs Interpreting Nabokov|  Actes

du colloque , Nice 21-22-23 juin 2006 Andrey Babikov :On Germination of Nabokov's "Main Theme". In his Story "Natasha"