SWITZERLAND 1963 ( 1st ALPINE FLIGHT 1913 ) TRAIL ERROR – DUCTOR BLADE FLAW MNH

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SWITZERLAND 1963 TRAIL ERROR – DUCTOR BLADE FLAW MINT NO HINGE SWITZERLAND 1963 PRO AERO ( ZUMSTEIN # F46 / MICHEL # 780 / SCOTT # C46 ) COMMEMORATING the FIRST ALPINE FLIGHT by OSCAR BIDER ( in 1913 ).A BLUE DUCTOR BLADE FLAW IS SEEN AS A HORIZONTAL LINE ON ALL 5 JET CONDENSOR TRAILS of the 5 JETS ( BELOW the GLIDER WING ). THIS STAMP IS MINT CONDITION with NO HINGE AND NICELY CENTERED, BUT SLIGHT FINGERPRINT on the GUM SIDE.