The different "edges" (i. e., topmost rim) on the same celery holder are made by using different rings to fit the press mould. This sort of variation can also be found in bowls and plates in American Carnival glass (plain, different numbers and sizes of scallops, etc. But don't confuse the edge made by a ring with crimping after the piece has been warmed in). When the celery holder is destined to be used upside down to support a bowl, the celery holder is likely made "pressed to shape" or finished by flaring only slightly (the more flaring, the harder it is to keep the piece from going somewhat out of round).