Hi, any help in ID'ing this bowl much appreciated

It's thick walled, has six lobes at the base and has a ( perfectly formed ) concave polished pontil mark.
The base is quite heavily worn.
My colour sense is pretty hopeless so I'll just call it green ( the streaky bits ) and blue.
Wt 520 gms
W 8 cms
H. 5.5 cms
Looked at a lot of stuff online ( Leerdam, Maastricht , Whitefriars , Scandinavian and Czech ) but haven't been able to find a match
Many thanks for looking
Scott