24+50 penny Leipzig fairground in mixed franking with no. 222 and no. 225 of the SBZ on airmail special delivery letter from Berlin to Leipzig, there however undelivered and again to Berlin returned. Both stamps Leipzig fairground from the right lower corner margin with complete printers marks, final value with first day postmark 4.3.51. The 60 penny heads of the SBZ with retroactive cancellation Berlin 8.3.51. Cover slightly discoloured, nevertheless very interesting document.