maroon aluminum group  

Not particularly rare.
I see them in all colors. Dark colors seem more common than light.
You asked (in posts that have since been deleted) about the value of Eames Aluminum Group chairs.
First thing to do is identify WHICH Aluminum Group chairs you have. There were a number of models -- low-back tilting swivel chairs, low-back fixed chairs, lounge chairs, high-back office chairs -- and they were available with and without arms and in fabric, vinyl, and leather. Each of those options affects the value.
Once you know which chairs you have, it's pretty easy to find values online. Ebay is as good a place as any to look, although it's important to compare prices for chairs in the same condition as yours. The Aluminum Group chairs are relatively expensive to reupholster, and the arms are tedious to refinish, so chairs with good upholstery and good arms sell for significantly more than chairs that need work.
Good luck...

thanks
thanks so much for you advice.