Rare Art Nouveau French cameo glass vase produced by Croismare for Muller Frères 1920s

Rare French cameo glass vase with an iris design, produced by Croismare for Muller Frères. 
The vase features a slender, baluster shape with a pale blue body overlaid with a mauve/brown iris design. 
It was created using the cameo technique, involving multiple layers of glass that were acid-etched or wheel-carved to produce the relief decoration.
Period: 1920s
Makers: Muller Frères (Brothers), a French glassmaking company founded by Henri Muller. 
Location: The vase was produced at the Croismare factory in France
Technique: It is a cameo glass piece, created using acid-etching and often featuring multiple layers of glass to achieve the detailed, 
Design: The vase features a slender baluster shape with an iris floral design in mauve/brown tones over a pale blue/green body.
Measurements:   34,5cm tall - 12cm diametre (foot) and 8cm diametre (mouth)