Rare "Ruben" - series by Signe Persson Melin designed for Kosta glasbruk 1960s Sweden

I'm selling a set of two glasses. Large and small. I assume they are red & white wine glasses but can also be beer and wine glasses.

Larger stands 15 cm (6") tall and with a volume of +30 cl (+10 Oz). Smaller stands 13 cm tall (5") with a volume of +20 cl (7 Oz)

In good used condition with som signs of use but no defects.