I have absolutely no ideas with this one. I haven't been able to find anything similar so any ideas or thoughts would be appreciated.
Stands 8 1/4" tall (210mm). Pale green glass of poor quality - full of small bubbles and pieces of refractory throughout.
Quite light. Dimple to each of 4 sides and below the lip has been widened, possibly to aid holding.
From the main body of the flask upwards has a fluted pattern in the glass.
Rough pontil.
Thanks for looking.