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View of the summit of the Säntis (2504 m) with its observatory and stone building, accessible via a stone staircase. Two people are visible at the base of the staircase. On the reverse, a handwritten letter addressed to Yvonne Clairier in Enghien-les-Bains, France, with a Helvetia 20-cent stamp and a cancellation from Winterthur dated 20.6.1933.