Early Italian Teardrop Vase by Martinuzzi or Zecchin

I believe this to be an early Blue Glass Teardrop Vase by Martinuzzi or Zecchin - BUT - it is unsigned -apart from the unground rough/rude pontil.
The weight of 1.6kgs,height of 28.0cm/11.0inches and a diam of 22.0cm/9.0inches.
16 Ribs with alternating long and short inverse teardrops!
I love it but would like any views of other collectors -