How can I tell if I have a swung glass vase?

To tell if you have a swung vase, first examine the seam along the body. On swung vases, this seam is usually more prominent near the base and becomes fainter and fainter as it travels upward toward the neck. Also, swung vases tend to have irregularly shaped pinched or dipped openings. Find a collection of swung vases on 1stDibs.