Thanks again, after doing a bit of research I think the Harrach attribution seems quite likely
Here are some Harrach pieces with very similar, light green (Uranium btw) zig-zag vines and leaves on opalescent ribbed glass:
>> vaseline vase on Warren Galle's site (left row, further down)
>> opalescent rose bowl on
http://theantiquarian.us/Hist. Harrach and Glass.htmI couldn't find a match for the bud / fruit, but like many other applied flowers from Harrach glassworks, it is made of opaque pink mottled glass...
The shape and cut top of my vase could make it a bit later production than other pieces with this applied decor.
And I forgot to mention in my opening post: there are some small mica flakes in the glass above the flower, a (nice) production flaw
Michael