Thanks Mike for the pictures and also the link to your WMF piece, I had forgotten about that thread.
It is certainly easier when viewing the vase in hand, the camera photos also have a habit of picking up background colour, which makes things trickier.
The iridescence Silver Chloride streaks do give a subtle purple/blue effect to the glass at certain angles. Also the thickness of the base also distorts the true colour again when viewing at certain angles.
Thanks for your thoughts Christine. I don’t know why I hadn’t thought about comparing the quality of the metal, which on close inspection is very similar to other Mdina pieces I have from the same period. There is also a multitude of small bubbles that can be seen within the base on close inspection, again a reminiscent feature of earlyish Mdina glass.
Handful of pictures attached...