$500 · Herman Millar Aeron Chair

I love this beautifully comfortable chair but it is too big for my needs. I believe it is a size C. The seat is approximately 19 inches square. It is in excellent condition. All the casters were replaced in January of this year. https://store.hermanmiller.com/office-chairs-aeron/aeron-chair/2195348.html?lang=en_CA (this link may not demonstrate the exact model).