Hi Tommy, it might be Polish, Krosno, Jozefina glass...they make them, and the swirl on the glass base is often a 'signature'.
Possibly worth a look at their website....but make a big cup of coffee if you go there as there is so much stuff to look at, and some of it is exquisite.
That is my guess anyway!!
Here is a link that might help, although because they are hand made, no two are ever quite the same.
http://www.jozefina.pl/03E.html