I have over 100 of these in very good condition. All have OSHA approved 5 star bases, with tilt, swivel and height adjustment. The item "50 Mid Century Charles Pollock office chair authentic knoll" is in sale since Wednesday, March 20, 2019. This item is in the category "Antiques\Periods & Styles\Mid-Century Modernism". The seller is "atomikhound09" and is located in Houston, Texas.This item can be shipped to United States.