i have two Hlava pieces, later Unikat style ones, one has a couple of scabby left-over labels on, no marks at all; the other is etched Ceska and has HLAVA written in capital letters by hand with some vibrating tool.
The "Hlava" is not a signature, just an indication of the designer.
But I don't know enough about other names to make any suggestions. I just felt it's a really big and unique sort of pieece and the reproduction of the mark could have included the letters of Hlava's name, and he did do unique designs.
As I said, other folk will know more than I do.