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Black and white view of a natural cave covered in rocks, surrounded by pines, with a paved path leading to it. Printed text at the bottom: 'SAINT-AIGU. — Grotte du Serment. — LL.'. Reverse: handwritten address to 'M. Sabatier, Mondlignon, Seme et Côte', printed text 'Tous les Pays étrangers n'acceptent pas la Correspondance au recto.', a green 5-centime stamp, and cancellation mark 'AIGU 10 OCT 1908'.