Tim - did you manage to identify this? I have one too, also with the polished pontil, although mine is completely clear glass, 18cm (7 1/8") tall with stopper :http://glassgallery.yobunny.org.uk/displayimage.php?pos=-17886
I've done quite a bit of research without a definitive answer. The Czech glass company, Artel, make a liquer decanter and glasses in the same style, but it only has 6 bands/hoops and has a longer neck. They do one in a pinky opalescent glass - I cannot enlarge your pictures due to some sort of PC glitch, so I haven't seen the detail on yours.
I have seen this style referred to as a "traditional Czech design" and, given the amount of wear on the bottom of mine I suspect it might be an earlier example, but that's as far as I got.
Hope it helps