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Panoramic view of Lake Serre-Ponçon with the Chapel Saint-Michel on a small island in the middle of the blue water, framed by mountains. On the reverse, printed text describing the dam (height 120 m, capacity 1.2 billion m³, power 360,000 Kw, works started in 1955, completed in 1960). French 25-centime postmark stamped 'BONNÉS ALPES' and handwritten letter addressed to Madame Ancheis in Pice (Alpes-Maritimes).