big fan of amethyst and this one very attractive, but since no marks or labels it may be a non starter.
Optically moulded - very pronounced ridges inside the vase, although only visible in a minor way on the outside and lacks any long ring when flicked, but not exactly a dull thud either. About 6.75" (170 m/m) tall.
Rim is a little wavy - not even all the way round.
Good quality depression on the base, and some reasonable wear - so could be 40 - 60 years old, possibly.
Quite a deep colour, but doesn't remind me offhand of a T/Webb shape, and doesn't have the ring for W/F's. Apologies for the reflections - rushing as usual.
All thoughts welcome, and thanks for looking. Regret I'm absent for the next 48 hours, but will get back on Saturday hopefully.