Here are some thoughts from the owner of the vases...
As to the new Cameo Vases, I'm confident in my mind that what has happened is that the flaw in the turquoise glass was discovered after the cutters had started, which may account for why it was abandoned. I have not seen a flaw in the citron vase yet, but there may be one. The other possibility is that these were trial vases, for a new shape design, and they decided not to proceed with them. Although they are not signed, there is no doubt they are Webbs.