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Hi. This is a classic antique Saint-Louis design with a 'turban' centre cane. The torsade is usally present, but due to the placement is rarely visible from above - in one I have the torsade is even lower in the dome.
I have heard it said that the torsade was intended to hide the sometimes obvious join between the pick-up and the casing glass, but that may be no more than speculation.
Alan