Small Sommerso Vase

Brought this off a fellow glass collector who is downsizing. It has the pontil mark from the Glass Works in Inglewood but was it a Tony Kuepfer piece or someone else experimenting?
Haven't seen a piece from there before like it but they obviously had the skills to do Sommerso.
I haven't been slack in my cleaning the marks around the rim are in the glass.
Just a small thing 90mm high.