Set of 4 vintage cobalt blue champagne flutes - glassware from Boussu

Set of 4 cobalt blue coloured glass champagne flutes inspired by Scandinavian design, series "Lavandou", model "Flute", created by Zéphire Busine for the Boussu glassworks in the early 1960s. They are in very good condition, with no noticeable damage. However, there are bubbles and small differences between the glasses, which is quite normal for mouth-blown glass. Dimensions: Diameter: 5cm, height: 18cm.