It's generally never good to see an unpolished base. If this vase isn't Czech (which I suspect it isn't), it's emulating a Czech design with the looping, rust coloured spiral. The Chinese have also copied this recently in vases. I can't remember the Czech designer...there are paperweights as well as vases with the same rust coloured spiral too. Hopefully it'll jog someone's memory here. Have to say though, the Czech ones are incredibly well excuted, really impressively made with no mistakes, wobbly bits or unfinished parts.