Unusual vase with blue decoration

Height 25 cm. Beautiful hand-blown vases with polished decorations from the 1920s. They have a polished top edge and a plane ground bottom. The vase is polygonal and decorated with thin blue applied glass bands. Between these there are sharpened crosses. The blue line itself is cut with thin lines between the crosses. Every other rib is clear and cut with small tooth cuts. We have never seen vases decorated in this way before with color. It is in good condition with two soft chips on the top. Item number: 13128