these vases are 1970s Chinese.
Occaisionally they turn up with a label.
They come in a big range of colours,with or without stripes, & several sizes, & get attributed to everyone from Murano to Stourbridge.
Quality is variable, & as you noted, they can be wonky.
I have a few of them, obtained cheaply in early collecting days.
As long as you don't pay much, they are colourful & look good in groups with other similiarly coloured items.