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Colored view of the Martin Tower in Bregenz, with a blue sky and red flowers in the foreground. On the reverse, handwritten text congratulates Madame Y. Viard in Leysin (Vaud) on an excursion to Lake Constance, dated 1973. Two stamps are applied: a green 20 schilling and a red 10 schilling stamp, with a cancellation from Vorbruggen, Swiss Heilen.