Czech Vase - Kralik, Ruckl, Welz or ???

I have been collecting this type of decor for 15 years and have been trying to figure out who made this thing... they start out as semi-opaque glass with a winding of multi-cololored glass, then they are pulled through some kind of form to create the zig-zag (or the surface is raked with a kind of tool).... next the piece is blown bigger (to expand the decor) and spun in another mold for the shape. The whole piece is acid treated after cooling to produce the satin finish. This piece is signed with a gold "Czechoslovakia". The last pic is a "brother" I think...

now, as an experiment (without ant criticism at all)
vote: Kralik, Welz, Ruckl or ???