seems to be a Jack Lenor...
seems to be a Jack Lenor Larsen Fabric....?
Edward Wormley used the same one
http://cercisdesign.blogspot.de/2010/08/edward-wormley-dunbar-sofa-and-c...
It's not Larsen fabric.
The color is very close but the weave is different.
I've never seen a chair with fabric tagged "Dux" on it that wasn't made by Dux, and then the fabric isn't tagged separately. Fabrics are rarely, if ever, tagged or labeled on a chair (which is very frustrating at times for fabric nuts like me).
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