Overshot! Yes thats it

Thank you for your replies.
Ok, have attached some pics of the bottom (and sorry I posted the same pic set twice before, how odd). As to a black light.. umm, I'll ask around for one. It looks a bit weird in the light and now I'm curious... So black light will be definitive as too uranium glass?
There are some small bubbles and bits inside the glass if I look very close, is this normal? I just read that overshot can be used to cover up bad batches of glass as well.
As to Chinese make - would the glass itself be perfect/clean or does this mean much? I guess I don't really mind if its chinese make, its pretty

but if its something special I'll give out too my mum for safe keeping!
Thanks again

Cheers
Ish