1950 1st Helicopter Flight: Trieste to San Marino - 3.9.50 - Red Trieste-San Marino - Primo Volo Postale con Elicottero - 3.9.50' & black 'San Marino - 1 Volo Postale con Elicottero' cachets - long cover: 230x104mm - two vertical creases clear of adhesives
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