Latest one - I'm sure some (or one) of you have seen this

Shape GI, size V - rather large at almost 12" , lovely stripy spiral pattern (one set of stripes vertical and the other twisting round to the right) generous sprinkling of Mica at the top.
Pictures not great - sorry!
The base is damaged - it's not an annealing crack - when you hold it up to the light and look down into it you can see the shape of the original large round pontil mark, this has been ground down to make the base flat, but in places it has been ground so thin the glass has gone through creating a hole!!
Interestingly this is actually a lamp base as the inside has been acid washed - so this raises the question would this have been done before the base grinding - if not, would they have bothered given the base was so thin!
Would have looked lovely lit up from inside

anyone got a spare lamp fitting?

3" internal diameter and 3 and 5/8" external diam.