Export fair - souvenir sheet on philatelic airmail cover with fair special cancel " (20a) Hanover - general. Export fair / 28.4.49" to Hamburg, with violet, four-line stamp "with 1. Fair special flight Hanover Hamburg transported" and with red, two line confirmation stamp within "transported through Special airmail the export fair Hanover 1949", tadelose condition with photo certificate H. G. Schlegel (from 1981) : genuine, defects are missing. " Michel 450,-