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View of the tunnel of the Grotte des Échelles in the Massif de la Chartreuse, with a building on the left and a sign indicating 'Grotte des Échelles - Guides at the tunnel entrance'. Printed text at the bottom: 'Route des Échelles to Chambéry - Tunnel (308 m in length) started under Napoleon I (1804), inaugurated in 1820'. Reverse: blank postcard with the fields 'Correspondence' and 'Address'.