Zeppelin Flight. 1933 (May 6-9), 1st SAF registered cover from Tanger to Brazil, franked by nine stamps (three - on reverse), including four air post values, cancelled by Tanger ''28.4.33'' ds, Friedrichshafen ''6.5.33'' connection and blue confirmation cachet, Pernambuco ''9.V.33'' arrival marking on the back, mostly VF and very scarce, Sieger #202, Est. $700-$800 (Image)