I've been told I've made a big booboo. Sorry.
Petr Hora did do vases with a big splash of enamels in, but one this shape or with a black backgorund is not in the book - I was going only by the splash feature, I wasn't looking as closely as I should have.
But your vase is surface decorated, isn't it?
I rather think it's something contemporary.
I am sorry. I got all excited for you, but I was mistaken.