Mysterious Bohemian (?) cased glass vase with ribbed greyscale pull up pattern

Here is a really unusual & interesting vase which I found cheaply in an op shop yesterday.
It captured my attention immediately, as there was just something so odd yet appealing about it that I had to take a chance.
The vase measures 19.5 cm tall, 7 cm across the base, & 3 cm across the top rim.
The decor is complex. A clear outer casing covers an intricate pull - up pattern in shades of grey, with an opaque white interior. The shape is a simple "stick vase" or solifleur, but with a quirky twist. From top to bottom the vase has a rounded triangular section, like a shield. The clear casing is quite thick at the bottom, forming a solid, stable base. The decor creates a wonderful spiral effect underneath.
I do strongly feel that this vase is old, despite the seemingly modern style. The age clues for me include the amount of wear/staining to the white interior. This is entirely commensurate with much of the cased Victorian era glass in my collection.
The decor is definitely one I've never encountered before in a grey scale colour scheme. In fact grey tends to be a fairly rare colour in art glass (I don't count the translucent "smoke" glass that was a trend in the 1970s). I'm referring to opaque grey glass, or variations of grey as seen here.
Imagine this decor in pink or blue, it would then make this vase a little easier to date as late Victorian. In orange it could be 1920s.
My guess on this outlier is somewhere between 1900 - 1920.
Gut instinct tells me it is of Bohemian origin - the cut top in particular.
Thoughts on a maker would be appreciated! Has anyone seen anything like it?