Maybe somebody else can add some info, I can only remember reading about a Stella company from the south of the Netherlands that VSL has worked with at some point and seeing a pressed mark on a smoked vase with a leaf pattern. Ivo confirms this company was Dutch in his book and adds that they merged with the Kristalunie in 1925.
The Glasmarken Lexicon mentions a company called Stella that was French around 19320/1930 but no added info, unfortunately.
Not much help, I'm afraid ....
