In the mid-1960s, Warren Platner designed a furniture series with round steel rods, which included these chairs. These two chairs are from the 1980s and have been reupholstered and re-covered.
Company label on the underside.

W 72 H 78 D 53 Hs 49
 
In 1966, the Platner Collection captured the “decorative, gentle, graceful” shapes that were beginning to infiltrate the modern vocabulary. The iconic pieces are created by welding hundreds of curved steel rods to circular frames, simultaneously serving as structure and ornament.