His Austrian pieces are (almost) always signed, and have a circular pontil mark.
So definately Skrdlovice.
It is a really deep inky blue (simlar to my
Stahlikova ashtray) -- I think the pic is a little misleading.
It's a great colourway...
I could have bought the shorter version of this design as well in clear and brown, but it was a little too expensive.
Michael