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Perspective view of a natural cave 10 meters deep, located in the rocks of the Pointe du Château in Perros-Guirec. The printed text on the front indicates the location and depth. The back features handwritten correspondence dated August 6, 1930, addressed to Mr. Leon Sizaire in Pournies, with two stamps of 15 and 25 centimes and a postmark from Paimpol.