For comparison, here's a knobbled Borske vase, similar base, but no pontil mark:
![](http://www.20thcenturyglass.com/images/items/bohemian_glass/borske_glass/thumbs/borskeglass_bobble15.jpg)
If it is Borske, I wonder if the pontil mark was necessary from when they added the handle?
Here's a different Borske jug (at least I'm pretty certain it's Borske) that does have a pontil mark:
![](http://www.20thcenturyglass.com/images/items/bohemian_glass/borske_glass/thumbs/borskeglass_hoop12.jpg)