Nic: That would make Murano a good bet, then.
The shape looked familiar and finally it occurred to me that it might be Dino Martens. He did reticello using those thick white stripes (A200 Model 6498 in the A. Toso catalogue, for example). None are shown in the hourglass shape but the catalogue shows very similarly shaped vases in other styles. The Intro to the catalogue (this is from Heiremans, Dino Martens
) says that customers could mix and match shapes and techniques, so I'd say that Martens is a possibility. The size concerns me somewhat, so you need someone who is more familiar with Martens than me (i know him through 2 little pieces I have and the book).
Just for interests sake, I'm including a link to an American who does fabulous reticello work, Kenny Pieper. He works in North Carolina, not Oregon as I first suggested. See the third frame on the left down, "Brian."http://www.pieperglass.com/portrait_gal_frameset.htm