Thank you Anne, for confirming that.
It was just that particular experience that made me wonder...
After I politely asked the seller if I could have a look at them, he told me they were Murano. I wasn't planning on buying them, but after having read about them over here, and never actually handled one, i was just curious...
So I asked him if he was sure they were Murano and not Chinese? Well, to make a long story short, he got very angry with me because of my question, he shouted at me that the Chinese vases have a smooth pontil, and basically... he told me I know nothing... all very well, I replied, but after talking to me like that, I know what you can do with your vases...
So thank you Anne, my intuition was right..