Hi everybody,
yes the seller on eBay had several- I think I saw at least 8 to 10 examples- of this weight
type auctioned and actually sold within the last 2 years.
This massive concentration makes the origin from France (or a region close to France) very plausible...
Resuming, we have found the following types:
only one object with the common green twists ( one ashtray), other than paperweights, was seen but lost...
lily of the valley on green stems over clear ground- this seems to be the simplest version
the same over a foamy blue cushion
other flowers (sunflowers, dahlias, edelweiss, ....) over blue foam
...other colour grounds were observed, a Grey green opaque powder.
Most have a lying S-formed spiral of various colours under the flower- there are some without it.
For dating, I would assume that they were made at some time between 1918 and before 1936, and not
later, because the modest quality of the design would surely not have kept up with the big names as Baccarat, St. Louis and others,
starting again in the early 1950ies.
Moreover, their design relates more to "folk art" and less to flower designs made in the late 19th and early 20th century.
At last, the dome is made of a very excellent and bright clear glass in most cases, and has an UV reaction similar to St. Louis of the 1840ies- light salmon or lavender pink...
The prices realized have increased,
best wishes, E.