Malta, 1926-28, ½d green + 2s6d vermilion and black. Tied by light purple cds on 1933 Chicago Graf Zeppelin flight cover, Friedrichshafen to Pernambuco, red German flight cachet and various transit postmarks, Pernambuco receiving backstamp, Very Fine, a very scarce usage from Malta. Sieger No. 238m. Scott No. 132+163  Estimate $500 - 750. $0 (Image)