Lot 91029 – 1930 (May 22) Porto Alegre-New York Flight cover with ovptd. three Zeppelin values

1930 (May 22) Porto Alegre-New York Flight – Europe Pan-America Round Flight. Cover to New York bearing the set of three Zeppelin overprinted values, additionally franked with 300r, tied by “Syndicato Condor Ltds. – Servicio Aereo no Brasil/Porto Alegre” cds’s, backstamped in transit at Recife, small cover tear at top not affecting the franking; ex Gruys.