4 blue crystal glasses with rectangular base

Four crystal glasses. With rectangular base (at first sight, one would think square). In good condition. No sparkle. Only the bases are blue in colour, made of cut crystal. You'd think the glasses were on it. Original, heavy and qualitative glasses. Great colors! Two different sizes. 2 glasses height 17.5 cm, diameter at drinking 5.5 cm, base 6.2 X 5.5 cm, weight 486 g / piece. 2 glasses height 11.5 cm, diameter at drinking 7 cm, base 7.7 X 7.3 cm, weight 676 g / piece.