In the June 30, 1979 Herman Miller Specifications Book this chair is categorized as an Eames Universal Base Chair: Operational Stool.
Although the pads are not as thick, this is the drafting height version of the EC228, which you can see here.
Black naugahyde upholstery, black rubber trim, black plastic shells.
Steel footring, bright polished aluminum (Eames Universal) base.
Photographed for this Catalog in January 2012.
See the 1979 Herman Miller catalog page here.
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