Czech?

Pink to cranberry vase is 11.25" (28.6cm) tall and 5" (12.7cm) wide at top.  Unmarked.  There is an almost circular internal crack through the base.  No outward signs of damage; no nicks, dings or chips indicating piece was hit or dropped.  Could this be a by-product of the manufacturing process?  Has anyone seen this occur in other pieces?  Looking for ID help please.

I've always assumed there is some internal "tension" in thick cased glass like this.
You do see this with Whitefriars glass, internal cracks with no obvious damage.
Washing with water, just a little too warm or too cold can cause this, in fact I had
a Whitfriars vase explode on the draining board after I'd rinsed it with tepid water!

This is most likely Chinese made. The unpolished base is a key indicator as is the like of refinement of the casing be and the pulling around the rim

The base has significant scratching indicating wear. Do you know when pieces like this may have been imported if from China?