Herman Miller Aeron Desk Chair a size B or C . It is the standard gray/black as most and this is the model that is highly adjustable with the movable arms, tilt forward and back and have the lumbar support on the back. These are selling on ebay for $650+ but I don't want to deal with shipping the chair as they are large and pretty heavy as a lot of the components are metal. This chair has been gone over by a professional and looks brand new you will have a hard time telling that it is used. Let me know if you have questions. Please don't ask me if they are available as I will remove the posting when they are sold. B size $509 and C's are $669. If there is an aeron you want I probably have it or can get it. Just ask!
I sell about 3500 aerons a year and have made sure the chairs are in perfect condition. You may see other aerons on Craigslist for less but they have not been checked and are usually just chairs people are just getting rid of. We stand behind our work so if anything goes wrong with it in a reasonable amount of time we will fix it for free or if anything happens long term we will be here to get it repaired at a reasonable rate as well. Buy with confidence with us!