I have just bought a set of 6 of these blue swagged tumblers. I have had a close look at the Ribbonette advert in 20th Century Glass, and I think that the swags on that are much more in a V shape than the swags on my tumblers. Also the tumblers in that set appear to be flared towards the rim, whereas mine are more straight sided, with only a gentle outwards slope all the way from the bottom.