Rindskopf Art Nouveau blue opal iridescent glass vase

This was an international purchase, a good opportunity to obtain a really nice example of Rindskopf, a maker which I am growing more & more fond of, though their products are not the easiest to find.
Made from two layers of cased glass, a translucent blue over an inner lining of opaque blue, it measures 18 cm tall, 5.4 cm across the top rim, & 7 cm across the base. The simple, 6 - way lobed form is complemented by an iridescent finish that transforms it into something very special.
Bohemian origin, circa 1900.