Topic: Cased spiral ribbed cylinder vase ID

[Keith M]

Hi, my first post here.
Could do with some help ID ing this cylinder vase which I picked up at a car boot a few weeks back. It's blue green (teal maybe?) with spiral ribbing and is cased clear. It has been hand worked and has a ground but unpolished pontil to the base. No other markings I can see.
I've searched online and in my books but haven't found anything similar enough to convince me of it's origins. Approx measurements 30.5 cm tall and 12 cm wide.
Have tried to attach pics, hope they work!
Any help would be appreciated,
Keith