Modern includes the last 30 or so years. I suggest you do a search on the board for Chinese. I don't think you will find your exact vase but they export huge quantities of glass in huge variety, much of it very similar to glass made elsewhere but the tell-tale sign is the lack of base finishing, i.e., the base is roughly ground. Unfortunately ebay and antique centres are full of Chinese glass being misidentified. Not all Chinese glass is derivative but much of it is churned out at speed to satisfy the world's requirement for low cost. BIG also seems to be a feature. A good hot-worked glass studio or factory takes more care with finishing (a small studio may not finish at all). I'm not quite sure how it feels old - "free-form" hot worked glass of this ilk is mid 20th century onwards and this sort of style is fairly ageless.