I bought this bowl a while ago and thought it would be easy to identify

but having searched a while I haven't seen anything similar.
It was a lovely lavender colour when I saw it, and turns a steel grey in the indoor lighting.
I thought it must be Czech and perhaps ZBS but I can't find anything so far. My tape measure has gone walkabout

but it is about 6" across and 3 " high approximately. The base is polished flat and shiny
Any help would be much appreciated.
thanks
M