Hi Marcus,
Pattern no. appears to be 11040, shown in the 1936 Markhbeinn catalogue (thanks to Siegmar Geiselberger of Pressglas-korrespondenz.de for the catalogue ref.). Markhbeinn 1936, Table 52 shows three sizes of this pattern, described as 'Vase à côte Pied Carré'. Smallest 11039 height 18cm, then 11040 height 25 cm, followed by a larger example, the proportions of which appear to match my vase, also no. 11040, no dimensions given. Available colours listed as 'Blanc, Ambre, Améthyste, Rose & Fumé'.
The Markhbeinn catalogue illustration is also reproduced in pk-2007-1-04-mb-Inwald-1940
Thanks,
Steven