Brazil 1930, Graf Zeppelin Recife to Rio de Janeiro & Recife to Lakehurst Flights, four covers...

Brazil
1930, Graf Zeppelin Recife to Rio de Janeiro & Recife to Lakehurst Flights,
four covers and one card, each franked with privately-issued Zeppelin stamp of the Luftschiffbau Zeppelin GmbH, sold by the Condor Syndicate as postage on mail sent from South America, examples both with overprint and without, noting four from Rio de Janeiro (May 24) to USA, one Recife to Lakehurst (May 28), the card being a real photo card showing a Junker in flight, a useful group.
Cover