Heavy trumpet-shaped vase made of black hyalith glass around 1925-30

Vase made of black, almost opaque glass, solid round base with decorative stripes in silver painting all around, spherical center piece merging into funnel-shaped body, polished vase rim, base with uninterpreted signature. Vase is in intact condition. Bohemia around 1915-30. Height: approx. 24.5 cm, top diameter: approx. 14.5 cm, weight 880 grams.