NABA-block 1934, along with 50 C. airmail stamp and 25 C. postal stamp (corner fault) on registered airmail cover, with clear mounted exhibition special cancel "national stamp exhibition NABA Zurich 6. X. 34" together with exhibition-R-slip of paper over Zurich airfield to Paris (arrival cancel), thence with different front- and reverse appropriate postal service official note and postmarks return to Zurich (arrival 10. X. 34) . Envelope left vertical fold trace outside of the franking, souvenir sheet at the right margin a small unevenness, nevertheless fine example, Michel 850.-