I believe that they are vintage and quite old, as all have significant base wear, are heavy and (to my eye, for what it's worth) display good artistic and technical quality. I have several reference books, one being Pina's "Italian Glass," which is a wonderful compendium - one of the best - full of a great variety of examples, but which I'm led to understand isn't always reliable in terms of identification of producer. Extremely similar examples of my 1st two bowls are described as being produced by A.V.E.M. (Hope springs eternal). Nothing like my 3rd bowl is pictured in the book.