not my area, but I'll do the head on the block bit to encourage the right people to have a look.
my opinion is that the base of this doesn't have the usual look of something that's been on the end of a pontil rod - although I'm aware that some Continental practices do leave only a circular mark rather than a solid scar.
In view of the shape of this item, then obviously it hasn't been press moulded, so if a pontil rod wasn't used then this may well mean a mould blown piece.
Your petrol lustre makes this look more akin to carnival glass, with the effect being achieved by salts sprayed whilst the glass is hot, thus creating the iridised look.
I was wondering if in fact the marks/damage to the base have been caused whilst the object was in a hot oven/kiln being sprayed with salts.
I'm not aware of 2 inch pontil rods - might tend to make the arm ache somewhat

now let us have the right answers from someone.

P.S. possibly too 'blue' for T/Webbs bronze?? - Somehow I don't think it has that sort of age.