Description

1925 (Oct 18) Plain envelope registered to Basel endorsed “Militar -Flugkonkurrenz – Dubendorf bearing 1923 Airs 15c + 20c + 25c + 35c + 50c making 145c rate tied Flug Platz Zurich (Dubendorf) /Flugpost cds & with blank registration label No 223 with red ink Flugplatz Dubendorf & with violet circ ular Militarflugkonkurrenz / Flugpost Zurich – St. Gallen & on reverse Basel (20 Oct) arrival cds