Victorian cased pink & white glass posy ring fairy lamp base

Another of my orphan fairy lamp parts! This large posy ring type base is made from opaque white glass layered with pink. The white layer contains uranium & glows bright green under blacklight. The rim is deeply crimped.
It has applied feet in clear glass - most of them are a bit chipped but I can live with that, it is an unusual piece, not often seen.
It measures 10 cm wide across, 10 cm tall, 9 cm across the inner opening & 8 cm across the inside of the inner opening.
It requires a suitable lamp cup & dome.
Possibly English.