The mold line surprises me too. It is usually the other way with molded beads.
Could they be wound beads, that are molded with tongs? That way, the seam is in this direction. Perhaps you could look at the holes. Any sign of winding?
However, they are very likely Czech, considering the uranium glass.

About the black and white beads. They have been made in Venice, but also in large quantities in the Czech Republic. And, they have also been produced for quite some time in India now as well.